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Opened July 1999, zOwie is the Internet's first and longest running discussion forum dedicated to Omega brand watches.

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Re: Very difficult vintage OMEGA to identify. Info. where??
In Response To: Very difficult vintage OMEGA to identify. Info. where?? ()

: I have what appears to be a very difficult vintage OMEGA watch to
: completely identify or explain. The dial side of the watch
: indicates "Automatic" "Officially certified
: Chronometer" "Seamaster", Serial number is
: 15,643,760 indicating a 1957 manufacture. I had a jeweler remove
: the back and it is a Calibre 505, 24 Jewel. Odd thing is that
: the back of the watch indicates "CONSTELLATION". The
: jeweler indicated that it appears the back is consistent with
: the rest of the watch body and has no reason to believe that it
: came from another watch. In checking with the Omega database the
: 505 is listed with Constellation watches only and I did not get
: information that the Seamaster ever came with a 505. So . . .
: ??? I am not sure how to get a photo on this posting but could
: send one if there is an interest.

Please do post photos

See the blue text above on "Including Photos In Your Messages", which is a link to a fine article on the process

What are the numbers on the inside of the caseback?

Calibre 505 was a no-date chronometer movement and indeed occurred with some chronometer Seamasters, but were relatively uncommon.

However, it is certainly possible that a Constellation case back that fit a Seamaster case was inappropriately used, as both collections used movements of the same dimensions.

Sam aka Hewybaby

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