Send the serial number to Longines; they'll tell you exactly what cal it was, when it was sold, and to whom.
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The movement looks like something from the Longines Cal. 23 series:
Do a look up on the longines serial numbers will certainly give you the date, but not the cal.
A list can be found at
It doesn't appear to be like my 23Z which has twin screws on the wheel near the winder as opposed to a central one. I note some of the 22 series have one central screw.
Hope you find out.
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That's a 12.68Z, but the regulator looks a little different than normal. Longines used either a flat balance spring or a Breguet overcoil, so maybe the regulators were different depending on which hairspring was employed (just a guess though). This caliber was introduced in 1929 and was used for nearly 2 decades. The 12.68Z is a miniature version of the 18.68Z, and replaced a few different movements in Longines' arsenal in an attempt to streamline production.
Here are pictures of the 12.68Z (not in my custody any more) and 12.68.ZS (still with me). I think I have seen some of the Longines watches with that regulator as well and it also seem to be a 15 Jewels version, so it is earlier than mine. To get approximate year of birth just punch the serial number in here http://www.vintagewatchresources.com...identifier.php and you will get approximate year of movement production.
And a bigger picture would also help
Zenith 8 3/4 F;Zenith 12-4-P;Zenith 12-4-P-6;Zenith 133.8;Zenith 2522 C;Zenith 40;Zenith 40-T;Zenith 2552 C;Zenith 50.0;Zenith 88-T;Zenith 18-28-3-P;Zenith 19 N.V.S.
Its marked "D" on the case back,so it should be mil issue watch.I have couple of movements with that kind of shock protection,mostly fliegers from 1930s.
Share my longines 12.68z
Pretty much the same watch
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