Casio G-Shock GA-B2100-1A1 'Carbon Core Guard' Bluetooth Solar
Digital-Analog Tool Watch / Lifestyle Sports Watch · Casio (Casio Computer Co., Ltd.). Tier: Durable Tool/Utility. Reputation for 'indestructible' timepieces and industry-leading value.
Period: Modern Utility (2022-Present). This model is an evolution of the 2019 'CasiOak' design language, integrating modern connectivity with vintage octagonal bezel cues.
Type
Digital-Analog Tool Watch / Lifestyle Sports Watch
Brand
Casio (Casio Computer Co., Ltd.). Tier: Durable Tool/Utility. Reputation for 'indestructible' timepieces and industry-leading value.
Movement
Casio Module 5689: Tough Solar (solar powered) with Bluetooth Smartphone Link. Accuracy of +/- 15 seconds per month (without link), 7-month power reserve on full charge.
Dimensions
Case diameter: 45.4mm; Thickness: 11.9mm; Lug-to-lug: 48.5mm; Lug width: 16mm (proprietary G-Shock connector). Wears smaller than 45mm due to the slim profile.
Description
The GA-B2100-1A1 is a masterclass in modernizing a cult classic. Known affectionately as the 'CasiOak' due to its octagonal bezel, this model adds 'Tough Solar' and Bluetooth connectivity to its ultra-slim profile. Its triple-black aesthetic provides a monochromatic, tactical look that transitions seamlessly from outdoor adventures to urban daily wear. It represents the pinnacle of Casio's 'Carbon Core Guard' technology, offering extreme durability in a lightweight 52-gram package.
Key Features
Bluetooth Smartphone Link (auto time adjust, phone finder), Tough Solar power, Carbon Core Guard structure, and the world-famous octagonal 'CasiOak' bezel design.
Dial Description
Matte black 'stealth' dial with double LED light. Features 3D applied indices, baton hands with Neobrite, a sub-dial at 9 o'clock for mode/battery, and a negative LCD digital display at 4 o'clock.
Case Material
Carbon-reinforced resin (Carbon Core Guard structure) with a matte black fine resin outer shell. High-impact resistance with a stealthy, non-reflective finish.
Crystal Type
Flat Mineral Glass. Recessed below the bezel height for added impact protection.
Bezel Details
Fixed octagonal resin bezel with engraved 'G-SHOCK' and 'PROTECTION' branding. Iconic silhouette reminiscent of high-end integrated-bracelet luxury sport watches.
Crown & Pushers
Four recessed resin function pushers (Adjust, Light, Mode, Start). No crown; time setting is handled via pushers or the Casio Watches smartphone app.
Bracelet or Strap
Black bio-based resin strap with a standard stainless steel pin buckle. Features quick-release spring bars for easy removal.
Caseback Details
Stainless steel solid case back secured by four screws. Engraved with module number (5689), reference, 'Carbon Core Guard' logo, and Thailand/Japan factory markings.
Movement Type
Casio Module 5689: Tough Solar (solar powered) with Bluetooth Smartphone Link. Accuracy of +/- 15 seconds per month (without link), 7-month power reserve on full charge.
Water Resistance
200 Meters (20 Bar). Suitable for recreational diving, swimming, and high-impact water sports. Sealed by a rubber O-ring gasket system.
Origin & Provenance
Japanese design and movement. Mass-produced in Casio's high-automation facilities (typically Thailand or China for this specific reference).
Age Estimate
Circa 2022-2024. This specific 'Tough Solar' version was launched in mid-2022 as an upgrade to the original battery-powered GA-2100.
Cultural Significance
This model helped pivot G-Shock from 'bulky tactical gear' back into 'lifestyle fashion' status. It is widely considered the most influential affordable watch design of the early 2020s.
Condition Notes
Based on the user description 'Ma pudełko jest nowy' (It has a box, it is new), the condition is Mint/New Old Stock (NOS). Case and crystal appear pristine with no resin rot or scuffing.
Value Estimate
MSRP: ~$150-$160 USD. Secondary Market: $100-$130 USD depending on region. High liquidity due to popularity.
Care & Maintenance
Clean resin with mild soap and water to prevent salt buildup. Ensure the solar panel receives occasional light exposure. Gaskets should be inspected every 2-3 years if used for swimming.
Similar Watches
Original GA-2100 (No solar/Bluetooth), GM-B2100 (Full-metal version), GM-S2100 (Mid-size version). Competitor: Timex Command or Suunto Core.
Interesting Facts
The original 2100 series became a viral sensation in the watch world because it was the first G-Shock to successfully blend high-fashion aesthetics (A.P. Royal Oak vibes) with $100 tool-watch utility.
Notes
Ma pudełko jest nowy