Watch guides
6 guides for watch owners, each built on the movements, batteries and watches in this reference. What comes from a maker’s document is marked with its source; what is general knowledge is labelled as such.
The guides
Start with the question you have. Each guide ends with the entity pages and tools it leans on.
0.5 vs 30
s/day, rated, middle quartz vs middle automatic
Quartz vs automatic watch
Accuracy, power, thickness and batteries of the two, set side by side from the movements and watches in the reference.
The most common quartz rating in our data is ±15 s/month; the most common automatic rating is −20 to +40 s/day. The guide sets rating, run time (38–80 h on a wind against years on a cell) and thickness side by side.
169
typed movement files, counted by kind
Watch movement types
Automatic, manual, quartz, solar, Kinetic, mecha-quartz and Spring Drive: what each one is and how to tell which your watch has.
62 automatic, 14 quartz, 22 solar, 68 Casio modules and a few hybrids, 5 files not typed. The guide says what each runs on and how to tell yours.
2
links out, in the page’s worked example
How to remove watch links
The three kinds of bracelet pin, the tools, and a calculator for how many links your wrist needs out.
Pin and collar, split pin or screw: how to tell them apart, how to take each out and put it back, and when to hand the watch over. A calculator turns your wrist and bracelet into a link count.
30–200
metre markings explained
Watch water resistance explained
What 30 m, 50 m, 100 m and 200 m markings mean for rain, swimming and diving, with the different rules in Casio, Citizen and Seiko manuals.
Rain, swimming, showering and scuba diving are different questions. Compare the actual Casio, Citizen and Seiko instructions before relying on a number printed on the case.
GA-2100
exact watch family to check against the kit
Casio GA-2100 mod guide
What Casio confirms, how to check strap and case kits, and when a modified watch needs a water-resistance test.
Casio gives the original watch dimensions and water rating. The guide shows which attachment and case interfaces still need a direct fit check before you buy a mod kit.
27.40
mm NH35A movement diameter, without dial spacer
NH35 and Seiko mod compatibility
TMI drawing dimensions and Seiko SRPD facts, with a part-by-part checklist and clearly marked unknown fits.
Start from TMI’s movement drawing and Seiko’s stock SRPD specifications; check the holder, dial, hands, stem and case interfaces separately before assembly.
How the guides are written
Every guide that quotes a number takes it from the same facts as the movement, battery and watch pages, and lists the documents at the bottom with the day we read them. We rank sources the way the methodology describes, and say so when a comparison rests on a small or lopsided sample.
The guides are prepared by the Watch the Details reference team and carry the date their words last changed. A wrong figure goes to the corrections page; a missing one, such as the bracelet data none of our watches has yet, is listed in the guide where it matters.
