Vintage unusual manual wind Omega kinda large size

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Well I dunno...looks kinda larger than what I am familiar with when it comes to Vintage Omegas. Looks like it's at least 36mm or more and wish I could open her up for a peek inside for the movement and model # but I hate popping these snap backs off. I'll just wait to find out when I give it to George at Tempvs Fvgit in NYC to get serviced later this month. I pictured it parked next to the 34-35mm Seamaster for size comparison. Stacking them next to each other with crowns up shows at least 2 or 3 mm difference in diameter.

Anyone got a clue what movement might be inside and approximate year of this thing? We love the size, patina on the dial and tan color.

 
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I can't answer, but am liking what I'm seeing in your photos.

Perhaps a 285 is under the hood?
 
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Size looks like it could be one of the 2506 references (I believe around 38mm in diameter excluding the crown) but the beveling of the lugs and case are different from what I've seen before. And come to think of it I don't think I've seen one that had "waterproof" etched/stamped into the back. Either way if you search Omega Jumbo's of the 1950s era you may find something similar.

Pretty cool Turler dial though! I'm not sure of the reason for why it's on the dial but seen a couple here and there, always wondered the significance.
 
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Pretty cool Turler dial though! I'm not sure of the reason for why it's on the dial but seen a couple here and there, always wondered the significance.

Turler was a large watch seller in Switzerland, hence he was allowed to co-brand the watches he sold.
 
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You made me get out my Türler and put it on. I always wondered what that second mark meant. It is evident that this is not a toubion.
I think this used to be an everyday watch. Or a weekend watch.
-j
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I noted down some refs case 14704 3 SC movement 591. Band is a replacement.