Casio Men Digital Quartz Watch with Resin Strap F-105W-1A

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Rotislav] then compares the simple design to buttons used on watches with higher water resistance ratings, which boast multiple O-ring seals and more complex designs.

Casio F105W and why I do wear it - menga.net

So someone suggested trying to swap out the F91 module with the F105 since it has the proper backlit "Illuminator" and they're very similar. The buttons also have a rubber O-ring seal to allow them to move in the case without allowing water to leak inside. When I was a kid (late 80’s to early 90’s), I used to go swimming with my watch still on my wrist, only ones claiming to be water resistant of course, and never had any problems with it. I wear a Casio MDV-106 every day and am more than confident that it’s claimed 200 meter WR is plenty.

The 4 screws holding on the back haven't stripped in the case (yet, IMO that's the weak spot with cheap Casios) It's a bit small for these days, about 35mm or so, but when I wore it every day it suited me just fine. The W-86, on the other hand, remains well within that ballpark, with a near-identical lug to lug size and only a marginal increase in the thickness and width, resulting in a similar on-wrist experience.

Just How Water Resistant Is The Casio F91W? | Hackaday Just How Water Resistant Is The Casio F91W? | Hackaday

Rostislav Persion] wanted to get a better idea of what this really meant, so set about investigating for himself. The straps on the F-91 are already known to wear out before the rest of the watch, so I think this one should last you a little longer.Za tú cenu dobrá kúpa, až na to združenie funkcie zmeny dátumu/času s podsvietením, ale dá sa to prežiť. Viewing angles and clarity are indistinguishable from the original unless you put them directly side by side.