REFERENCE GUIDE · Casio
Casio G-Shock · all black
GA-2100-1A1 · Compare the standard all-black GA-2100 reference across sellers.
Compare observed listings ↗SOURCE THE SPECIFICATIONS
- Reference
- GA-2100-1A1
- Movement
- Analog-digital quartz
- Round-case width
- Not confirmed / square case
- Case length
- Not confirmed
- Manufacturer water rating
- 200 m
- Crystal
- Mineral
Manufacturer source ↗ · Reference research reviewed 2026-10-14. Confirm the complete variant and listing details.
Before you choose a listing
Modified cases and custom editions are excluded when their titles identify them. Inspect module, strap and markings in the actual photographs.
Fit considerations
Check strap curvature and the full case measurements; an octagonal case is not directly comparable to a round diameter.
What to confirm with the seller
Match the complete reference to the actual photographs and paperwork. Check crystal and case wear, included accessories, bracelet links, return terms and delivery charges.
Manufacturer specifications describe the model. TickDeals has not inspected, authenticated or tested these individual watches.
THE WATCH FINDER
Find your reference. Compare your options.
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Finding your watch options…
Listing prices are in USD. Shipping and taxes may vary by destination. TickDeals does not sell or authenticate watches. Availability is confirmed on eBay.
START WITH A MODEL
A focused collection. More useful context.
Specifications, fit considerations and listing checks.
OUR METHOD
Useful comparisons,
with their limits made clear.
We source selected watch references from eBay listing data and match references in listing titles. Photos and condition descriptions belong to each seller. A title match is not an authenticity check.
Asking-price context compares at least five observed listings for the same reference and reported condition. It shows listing prices before shipping and taxes. These are asking prices, not confirmed sale prices or a valuation.
Price drops appear only when we observe a lower price for the same listing in successive snapshots. Seller reductions use an explicit seller reference price. A seller reduction is not an independent valuation.
Saved searches and price targets stay in your browser and are checked when you revisit. They do not send email or background notifications. Product specifications link to manufacturer sources; unconfirmed fields are identified.