Casio G-SHOCK 2500 Series Two Eye Analogue Watch (GAC-2500-1AER)

Overview

The Casio G-SHOCK GAC-2500-1A combines the legendary toughness of G-SHOCK with a refined, minimalist approach to analogue timekeeping. Part of the innovative 2500 Series, this distinctive watch features an all-black design, a contemporary octagonal case and an entirely analogue display that reinterprets the functional beauty of the original DW-5000C. Its understated appearance places emphasis on the essential elements of timekeeping, creating a versatile watch that balances traditional design principles with advanced engineering.

Beneath its streamlined exterior, the GAC-2500-1A incorporates Casio's innovative magnetic Shock Release Hand technology, a multifunction Multi-Mission Date display and a dedicated small seconds subdial. With shock-resistant construction, 200-metre water resistance, amber LED illumination and a lightweight 47 g design, it delivers dependable performance in a compact, comfortable format. Bio-based resin components and a battery-saving seconds-hand sleep function further enhance its everyday practicality.

Key Features

• Innovative G-SHOCK 2500 Series design inspired by the original DW-5000C
• Minimalist all-black styling with a matching case, dial and strap
• Fully analogue display with a distinctive two-eye dial arrangement
• Iconic octagonal bezel with refined, contemporary proportions
• Magnetic Shock Release Hand designed to absorb and dissipate impacts
• Shock-resistant construction for dependable everyday durability
• 200-metre water resistance for swimming and outdoor activities
• Multi-Mission Date display with multifunction three-cell window
• Dedicated small seconds subdial featuring the G-SHOCK Shock Resist motif
• Seconds-hand sleep function to help conserve battery power
• Three-dimensional resin dial with raised hour markers for intuitive readability
• Amber LED illumination with afterglow for low-light visibility
• Neobrite luminous coating for improved time reading in darkness
• Elapsed-time stopwatch with an approximately 30-minute measuring capacity
• Full auto calendar programmed through to 2099
• Hand Shift function for an unobstructed view of the in-dial display
• Bio-based resin case components and flexible resin strap
• Lightweight 47 g construction with a compact 44.5 mm case width
• Approximately two-year battery life under normal operating conditions

Specifications

• Model: GAC-2500-1A
• Collection: G-SHOCK 2500 Series
• Display: Fully analogue with multifunction date window
• Case Dimensions: 46.7 × 44.5 × 12.7 mm
• Weight: 47 g
• Case & Bezel Material: Resin / bio-based resin
• Case Colour: Black
• Dial Colour: Black
• Strap: Black bio-based resin band
• Compatible Wrist Size: 145–215 mm
• Glass: Mineral glass
• Construction: Shock Resistant
• Water Resistance: 200 metres (20 bar)
• Movement: Analogue quartz
• Power Source: CR1025 battery
• Battery Life: Approximately 2 years
• Timekeeping Accuracy: ±15 seconds per month
• Illumination: Amber LED light with afterglow
• Luminous Features: Neobrite
• Stopwatch: 1-second measurement with a maximum capacity of 29 minutes, 59.5 seconds
• Calendar: Full auto calendar to 2099
• Additional Features: Magnetic Shock Release Hand, Multi-Mission Date, Hand Shift and seconds-hand sleep function
• Country of Manufacture: Thailand

Minimalist All-Black Design

The GAC-2500-1A takes a considered approach to G-SHOCK's traditional design language, combining a monochromatic black finish with carefully sculpted surfaces and a distinctive octagonal silhouette. The matching resin case, dial and strap create a cohesive appearance that emphasises the watch's proportions and structural details without relying on contrasting colours or unnecessary decoration.

Drawing inspiration from the original G-SHOCK DW-5000C, the 2500 Series retains the familiar octagonal bezel while introducing a more contemporary interpretation of its shape. The streamlined case features carefully considered contours and balanced dimensions, creating a watch that maintains the recognisable G-SHOCK identity in a refined, compact format.

The black resin dial incorporates raised bar indexes and subtle three-dimensional detailing, adding visual depth while maintaining the simplicity of the overall design. Carefully proportioned hands feature a distinctive parallel-line arrangement that echoes the geometry of the case and hour markers, creating a consistent aesthetic throughout the watch.

This understated colour scheme makes the GAC-2500-1A particularly versatile, complementing tactical clothing, outdoor equipment and everyday casual wear. Its restrained appearance provides a distinctive alternative to larger G-SHOCK models with more elaborate digital displays.

Innovative Fully Analogue Timekeeping

Unlike conventional G-SHOCK watches that combine analogue hands with digital LCD displays, the GAC-2500-1A adopts an entirely analogue approach to timekeeping. Its distinctive two-eye dial arrangement provides essential information through a carefully engineered combination of central hands, a dedicated small seconds subdial and the innovative Multi-Mission Date window.

The central hour and minute hands provide intuitive time reading, while the small seconds subdial at 9 o'clock offers a separate indication of passing seconds. A subtle Shock Resist motif appears on the tail of the small seconds hand, referencing the origins of G-SHOCK and its long-standing commitment to durable watchmaking.

Positioned at 3 o'clock, the multifunction date window integrates additional information into the dial without disrupting its minimalist appearance. Its colour-matched design reduces unnecessary visual contrast, helping maintain focus on the primary hour and minute indications.

The result is a distinctive watch that combines the familiar simplicity of traditional analogue timekeeping with the practical functionality expected from a modern G-SHOCK.

Magnetic Shock Release Hand Technology

One of the most significant innovations within the GAC-2500-1A is Casio's magnetic Shock Release Hand system. Developed to enhance the durability of the analogue movement, this technology uses magnetic force to secure the minute hand rather than relying on a conventional direct attachment to the movement shaft.

The magnetic holding structure allows the minute hand to absorb and dissipate energy generated by impacts and vibration, helping protect the internal movement against the shocks encountered during active use. This innovative approach supports G-SHOCK's established reputation for toughness while enabling greater flexibility in the design of the watch hands.

Because the minute hand is magnetically secured, it may temporarily move or vibrate following a significant impact. This is a normal characteristic of the system, and the hand is designed to return to its correct position within a few minutes.

Combined with the watch's shock-resistant case construction, the Shock Release Hand demonstrates how Casio continues to develop new technologies that enhance the durability of traditional analogue watches.

Multi-Mission Date Display

The GAC-2500-1A features Casio's innovative Multi-Mission Date system, which uses a multifunction three-cell window positioned at 3 o'clock. Unlike a conventional date display, this system performs several functions while preserving the clean appearance of the analogue dial.

During normal timekeeping, the window provides a convenient date indication. When different operating functions are selected, the display can also communicate mode information, stopwatch measurements and settings through its specially developed mechanism.

The colour-matched window integrates naturally into the black dial, reducing visual distraction and reinforcing the watch's minimalist design philosophy.

The Multi-Mission Date system also supports a full auto calendar programmed through to 2099. Once correctly configured, the calendar automatically accounts for different month lengths and leap years, removing the need for regular manual date adjustments.

G-SHOCK Shock Resistance

The GAC-2500-1A retains the robust shock-resistant construction that has defined G-SHOCK since the introduction of the original DW-5000C in 1983. Its protective resin case and bezel are engineered to help safeguard the internal movement against impacts and vibration during everyday activities.

The combination of a durable case structure, flexible resin strap and advanced Shock Release Hand technology provides dependable protection without introducing unnecessary weight. Mineral glass protects the dial against the wear associated with regular use, while the carefully designed case maintains the distinctive appearance of the 2500 Series.

Weighing just 47 g, the GAC-2500-1A offers a lightweight alternative to larger sports watches. Its compact dimensions make it comfortable during extended periods of wear, whether used throughout a working day, during travel or while participating in outdoor activities.

200-Metre Water Resistance

With 200-metre water resistance, the GAC-2500-1A provides dependable protection against exposure to water during swimming, wet weather and recreational water-based activities. This substantial level of resistance makes it a practical choice for users who regularly encounter challenging outdoor conditions.

Combined with G-SHOCK's renowned shock-resistant construction, the water-resistant design delivers versatility across a wide range of environments. From everyday commuting and travel to outdoor recreation and physically demanding work, the GAC-2500-1A is designed to provide reliable timekeeping when exposed to the elements.

Amber LED Illumination & Neobrite

The GAC-2500-1A incorporates an amber LED light designed to improve visibility in low-light conditions. The warm illumination provides a convenient way to check the analogue display after dark, while the afterglow function extends visibility briefly after activation.

Neobrite luminous coating offers an additional means of reading the time in darkness following exposure to light. Together, these features help maintain the practicality of the watch during evening activities, travel and use in poorly illuminated environments.

The amber illumination also provides a subtle contrast against the black dial, complementing the understated styling of the GAC-2500-1A without compromising its minimalist appearance.

Watch Features & Functions

• Analogue Timekeeping: Central hour and minute hands, with the minute hand advancing every 20 seconds.
• Small Seconds Subdial: Dedicated seconds indication positioned at 9 o'clock, featuring the G-SHOCK Shock Resist motif.
• Multi-Mission Date: Multifunction three-cell display providing date information, operating modes and stopwatch indications.
• Stopwatch: 1-second elapsed-time measurement with a maximum measuring capacity of 29 minutes, 59.5 seconds.
• Full Auto Calendar: Automatically adjusts the date through to 2099, including different month lengths and leap years.
• Shock Release Hand: Magnetically secured minute hand designed to absorb and dissipate impacts.
• Hand Shift: Temporarily moves the hands to provide an unobstructed view of the in-dial display.
• Seconds-Hand Sleep: Allows the small seconds hand to be stopped when not required, helping reduce power consumption.
• LED Light: Amber illumination with afterglow for improved visibility in darkness.
• Neobrite: Luminous coating to assist analogue time reading in low-light conditions.
• Quartz Accuracy: Approximately ±15 seconds per month under normal operating conditions.

Battery-Saving Seconds-Hand Sleep Function

The GAC-2500-1A incorporates a practical seconds-hand sleep function designed to help conserve battery power. When continuous seconds indication is not required, the wearer can stop the dedicated small seconds hand, reducing the energy consumed by the movement.

Under normal operating conditions, the CR1025 battery provides approximately two years of operation. The seconds-hand sleep function offers an additional way to manage power consumption, making the watch particularly convenient for users who prefer dependable, low-maintenance equipment.

Unlike smartwatches and rechargeable devices, the GAC-2500-1A does not require regular charging, smartphone connectivity or software updates. Its conventional quartz movement delivers reliable timekeeping with straightforward operation and minimal user intervention.

Lightweight Bio-Based Resin Construction

The GAC-2500-1A incorporates bio-based resin materials in its case, bezel and strap. Derived partly from renewable organic resources, these materials provide an alternative to conventional petroleum-derived plastics while maintaining the flexibility and durability required for everyday watch construction.

Measuring 46.7 × 44.5 × 12.7 mm and weighing just 47 g, the watch offers a comfortable balance between robust construction and compact proportions. Its flexible resin strap accommodates wrist sizes from 145 to 215 mm, providing a secure fit for a wide range of users.

The lightweight design makes the GAC-2500-1A particularly suitable for prolonged wear, while its restrained black finish allows it to transition easily between professional environments, outdoor activities and everyday use.

Why Choose the Casio G-SHOCK GAC-2500-1A?

The GAC-2500-1A combines the enduring appeal of G-SHOCK's original octagonal design with a distinctive new approach to analogue timekeeping. Its minimalist all-black appearance, carefully proportioned case and innovative two-eye dial create a refined alternative to conventional digital and analogue-digital G-SHOCK watches.

Beyond its styling, the watch introduces advanced features including a magnetic Shock Release Hand, multifunction Multi-Mission Date display and battery-saving seconds-hand sleep function. With shock-resistant construction, 200-metre water resistance, amber LED illumination and lightweight bio-based resin materials, the GAC-2500-1A offers a practical combination of durability, comfort and innovative engineering.

For anyone seeking a versatile G-SHOCK with understated styling, traditional analogue readability and the dependable performance associated with the brand, the GAC-2500-1A delivers an excellent balance of contemporary design and everyday functionality.

Authorised Casio Retailer

TacTree is an authorised Casio UK retailer. All Casio watches supplied are 100% genuine, brand new and sourced through approved UK distribution channels. Orders are supplied with official Casio packaging and manufacturer documentation for complete authenticity and peace of mind.