Omega Marine Standard – CK 3635/3683 (Second Generation) ca 1941

Near as I can tell this is a CK 3683, follow-up to the original CK 3635 with revised crystal architecture but same case principles. - Please correct me if I’m wrong.

Nice clean hand wind caliber T 17 movement. Service history unknown but running smoothly.

Amazing brushed silver dial with enamel Arabic numerals, double minute track and blued steel hands. Note: It has been pointed out that the logo may have been retouched.

23-mm not including the crown x 38-mm lug tip to lug tip.

$1950.00, PayPal and US shipping included, international shipping OK, cost by location.

Offers considered, hard to find comps on these.
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That's an incredibly nice dial for one of these, looks spectacular!

Very nice. There's a gap in my collection for one of these - shame I'm not in the market at the moment 🙁

For those who don't know, CK 3683 is the second iteration of the Marine Standard. It had an improved design over the first iteration CK 3635 (introduced in 1939). The improvement was that the crystal was now inserted into the internal case from the outside and then cemented in place, which gave better waterproofing at pressure and was patented in 1941. The Marine Standard was the new generation of the original Marine watch [ref CK 679] which was the first commercially available diver's watch, launched in 1932. They're lovely, although pretty small on the wrist by today's standards. And it took until cal. 8500 in 2006 for Omega to produce a movement with longer power reserve than the 60 hours the T17 will give you.

These are historically notable watches 😉

GLWS !

Norm, the more I look at this and the patent diagrams for the two versions of the Marine Standard the more I suspect this is a CK 3635.

This is mainly due to the design of the shoulder around the upper surface of the crystal and the way the gasket slots in to what looks like a groove within the crystal.

It's hard to find any decent picture of a CK 3683 to be sure. AJTT has none, for example. The movement no and case no aren't conclusive either way.

I thought the best way to tell was by the patent numbers inside the case back. Unfortunately the patent no in the case is the patent for CK 679... http://www.google.co.uk/patents/US1907700. This is the case with both the Swiss and US patent no's.

Not sure if this takes things a lot further, so let me know if you want me to send copies of the patent diagrams over so you can check it yourself.