What are your favorite Omega vintage calibers?

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Got to go with calibers 5xx and 32x.
Probably because I've never had other interesting calibers.
Perhaps a bumper could be a nice addition.

 
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I have had nothing but good experiences with a well serviced 564. I love the chronometer features and quickset dates...I also love the 751 for the same reasons as the 564. If I am on vacation, or on a trip through many timezones, I lose track of the day so the day/date is a very useful feature (despite all the snarky comments on various forums)
+1 for cal 564.
 
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I own and have been wearing 550, 560, 561, 563, 565, and 751 calibers for almost 30 years now..

Best watches I've ever owned, and as long as they can be repaired, I'll never wear anything else!