Omega

. . . down to the strap and bracelets.  A good start!

All three are top-loaders, which require special tools and experienced handling to service, much less mundane matters like changing crystals.  Most old-school watchmakers have the special tools and requisite know-how, but my hunch is many newer watchmakers don't.  General purpose jewelers and the like shouldn't be tasked with opening these cases.

The Genève Dynamic (ref 166.0039?) is perhaps the most appreciated by Omega collectors of the three.  Should be late '60s production, fitted with a cal 565 movement. 

The Cosmic 2000 (ref 166.0130?) is probably the least common of the three in terms of production, judging by its relative scarcity on the secondary market compared to the other two.  Early '70s production, cal 1010 movement.  This family of Lemania-designed movements is less compelling to Omega collectors than the movements in the other two, which are wholly designed and produced by Omega.  If I had to triage the three on account of servicing costs, this is the one I'd save for last. 

The Seamaster Cosmic (ref 136.017), mid to late '60s production, is the most compelling personally.  A friend of mine inherited one earlier this year, and had my watchmaker service it.  His required a crown and crystal, which I'm happy to report are still available.  The manual wind cal 613 movement is a delight to the eyes, and capable of excellent performance.  I've a related cal 602, and that watch is the most accurate in my collection.

Are you keeping all three?

Cordially,

Art

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