Reference is OT 2872 Calibre 320, mine's from 1958 in 18K rose gold, not hugely collectable and they have a big weakness in that the pushers are square and have no sealing at all. As a result not only are they NOT waterproof, they're not humidity resistant or dust resistant either, anything can get in past the pushers.
Nice watches to wear though and they get a lot of compliments.
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