Identify Sultana Caliber Zero (0)

sleepyastronaut
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Anyone recognize the movement in this little Sultana wristwatch? The only mark on the main plate I can make out is a zero, six or nine. The more I look at it, the more it looks like a stamped zero with a tangential scratch. 15 jewels, circa 1935, the movement measures 25.2 mm x 17.4 mm.

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Searched through Ranfft for 7-3/4 x 11 L movements but couldn't find a match for this setting spring. My best lead from Ranfft is that Revue fastened their setting lever springs through the intermediate wheel.

Thanks in advance!

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Edited:
 
Canuck
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I checked four BestfIt fingerprint catalogs, and nothing matches.
 
sheepdoll
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Why there is a real need for an AI watch identification system.

-j
 
Canuck
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sheepdoll sheepdoll
Why there is a real need for an AI watch identification system.

-j

The Bestfit catalog I referred to has been around for probably 60 + years. Or, since about the time the subject watch was produced. It was and is still useful for people who want older watches repaired, and for those of us who repair them. I know, the concept of actually fixing a watch rather than turfing it, and buying another watch might seem odd to some folks!
 
sheepdoll
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Canuck Canuck
The Bestfit catalog I referred to has been around for probably 60 + years. Or, since about the time the subject watch was produced. It was and is still useful for people who want older watches repaired, and for those of us who repair them. I know, the concept of actually fixing a watch rather than turfing it, and buying another watch might seem odd to some folks!
I downloaded the catalog recently. Which is why it would be a good place to start training an AI for parts identification. A project I have been mulling over for some time.
 
sleepyastronaut
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Canuck Canuck
I checked four BestfIt fingerprint catalogs, and nothing matches.

Thank you for checking, Canuck.

Was hoping a base caliber would give me a part number for an alloy mainspring. I'm reluctant to reinstall this carbon steel spring.

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sheepdoll
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You should be able to measure the spring and barrel. I think there is a guide in the bestfit catalog. There are two scales used, dennison and metric. Probably easiest to use metric.
The calculation is fairly simple. A lot of watchmakers did not trust the ready fit springs, so this was sort of a basic skill.
 
JimInOz
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I went through my Paulsons catalogue from 1950 but nothing identical. Many similar (ETA 735/757 etc) but slight differences ruled them out.

Shouldn't be too hard to measure up the original and get a GR replacement.
 
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