Casio watch database and price guide

Casio G-Shock GA-2100-1A1: specs, new price and used value

For the USA market, a fair used price for the Casio G-Shock GA-2100-1A1 is usually $45-85. A good buy is normally under $60, while prices above $95 need unusually strong condition, full set, warranty, scarcity, or live market confirmation.

Retail price band
$99-120
New online band
$75-110
Used fair range
$45-85
Good buy under
$60
Avoid over
$95
Value retention
medium

Direct answer for buyers

For the USA market, a fair used price for the Casio G-Shock GA-2100-1A1 is usually $45-85. A good buy is normally under $60, while prices above $95 need unusually strong condition, full set, warranty, scarcity, or live market confirmation.

Verdict: A fair used G-Shock CasiOak digital watch sells for $45–$85. Buy at $60 or below; treat anything above $95 as overpaying.

Watch specifications

  • Brand: Casio
  • Collection: G-Shock CasiOak
  • Reference: GA-2100-1A1
  • Category: analog-digital sport watch
  • Movement: Quartz analog-digital module
  • Case size: 45.4 mm
  • Lug-to-lug: 48.5 mm
  • Thickness: 11.8 mm
  • Crystal: Mineral glass
  • Water resistance: 200 m
  • Market region: United States / North America
  • Currency: USD

Who should buy it?

Best for: Anyone after one dependable digital watch in the $45–$85 used bracket rather than a collection, and who would rather bank the discount than pay retail.

Not ideal for: Anyone expecting strong resale — this digital watch retains value at an average level, and listings above $95 are the clearest sign of an optimistic seller.

Market notes and resale

The octagonal case made it a design favourite, which keeps prices firm. Blackout colourways hold value best; bright variants discount faster.

Price confidence: Early editorial estimate — verify current listings. Last editorial review: 2026-10-03.

Used buyer checklist

  • Confirm the exact reference and dial configuration before paying
  • Check the resin bezel and strap for UV yellowing or cracking
  • Compare the asking price against the 45-85 used band on this page
  • Verify the module: backlight, alarm, timekeeping and buttons
  • Ask when the battery or solar cell was last serviced

Known issues and pricing traps

  • Resin parts yellow and crack with age and UV exposure
  • Module failure on older digital references is usually uneconomic to repair
  • Expect normal depreciation, not a windfall

Similar watches to compare

How this price range is set

Editorial estimate for the US market, not a live quote. Bands reflect typical retail and second-hand pricing for this reference and are revised when sold-listing evidence arrives.

Ranges are reduced for condition, missing links, no box or papers, unknown service history and poor photos, and adjusted when current new-watch discounts make a used price unattractive.

FAQ

What price should I target for the Casio G-Shock GA-2100-1A1?

Use $60 as the good-buy target. The fair used range is $45-85, and a used listing above $95 needs unusually strong condition, completeness, warranty or scarcity.

Should I buy the Casio G-Shock GA-2100-1A1 new or used?

Compare the used asking price with the current new online band of $75-110. If the saving is small, buying new can be safer because you get warranty and cleaner return rights.

What changes the value most?

Condition, box and papers, bracelet or strap completeness, service history, seller reputation, warranty status and unusually poor listing photos move the real transaction price.

What should I check before buying used?

Check the exact reference, case and bracelet condition, movement/module function, service or battery history, seller feedback and whether the price still makes sense after tax, shipping and return risk.

Important pricing note

USA watch prices move with condition, state sales tax, seller type, box and papers, current discounts, service history and seller trust. Use this page as a research starting point, then verify live US listings before paying.