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Everybody knows that quartz chrystals are a bit of a lottery so I decided to check the accuracy against factory specs of 6 of my watches by monitoring them during 30 days with my own eyes and tools (atomic internet clock).
Casio G SHOCK G100 (5158): +3 sec/month
Casio AE1200WH the Royale (3299): -6 sec/month
Casio A168 (3298): +6 sec/month
Casio F91-W (593): +12 sec/month
SEIKO SQ100 (5Y22): +6 sec/month
GOBIN (Miyota 2035): -6 sec/month
As you can see the F91-W is the worst performer but…
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