[ GUIDES ]
Practical answers for digital watch collectors, written by collectors.
CR2016, CR2025 and CR2032 share a diameter but not a thickness. What actually happens if you use the wrong one in a watch.
Step-by-step guide to changing a digital watch battery yourself: case back types, tools you need, and the mistakes that damage vintage watches.
A leaked battery doesn't always mean a dead watch. How to assess corrosion damage in a vintage digital and clean what can be saved.
CR, SR, LR — what watch battery codes actually mean, how to read them, and which chemistry your digital watch needs.
Blank screen after a Casio battery change? The AC contact reset takes ten seconds and fixes it. Here's how it works.
How to work out when your vintage Casio was actually made: module number, markings, catalogs, and the clues that narrow the year.
The Casio F-91W is one of the most faked watches on earth. The reliable tells: case back, module, display font, and where fakes come from.
Is a 30-year-old "water resist" watch still water resistant? The honest answer, what the ratings mean, and what actually fails.
Spreadsheets, notes apps, or a dedicated tracker: how watch collectors actually keep track of what they own, and what information is worth recording.
How to find the original manual for any vintage Casio or digital watch — usually free, official, and two minutes away.
What a Casio module number is, where to find it on your watch, and what it unlocks: manuals, parts, and exact identification.
Scratched acrylic or resin watch crystal? Most scratches polish out at home. What works, what doesn't, and when to stop.
Black blobs spreading on your vintage LCD display: what LCD bleed is, why it happens, and the honest answer on whether it can be fixed.
How to measure your watch's strap size correctly: lug width, length, and why vintage digital watches often need special sizes.
Vintage resin watch straps dry out and crack. Your realistic options: NOS, aftermarket, adapters — and what to avoid.