My Monday to Friday watch is a Citizen Promaster diver.
I work on the water and am constantly up to my elbows in the Fraser River. I work with chains, cables and logs and my watch has a few good scuffs to prove it.
This could definitely be why mine is about +50sec/day 😳 I haven't cracked it open to regulate it yet. I don't have a time grapher and also do really want to wear it as my main watch for a week of two to dail it in. So it's been demoted to my dress watch 😂
I have the same Promaster diver as @TimeToRide and I have been trying to drown it and shake it and generally beat it up. In the last seven months it has taken everything I've thrown at it and barely lost a second or two. My wife wears a Citizen Calendrier and won't even look at another watch, she loves hers too much. But these are both eco drives. I haven't ever handled a automatic citizen but I wouldn't pass on a sale as good as the one you found.
I've never seen it done on watches but we use to fill cheap flashlights with mineral oil and dielectric grease. We would use them well diving. If we left any airspace the gas would compress and water would leak in. I do see why the same thing wouldn't apply to a watch. Just remember the grease for all the electrical contacts.
As for the batteries we could usually change them once but they never lasted long after that.
My work knife/watch combo. Perfect for working on the water. I need a knife that I won't cry if I drop in the river and is easy to open and close with gloves. The watch holds up to everything I throw at it plus an accidentally swim or two
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