questions about a vintage PW

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I'm hoping someone more knowledgeable about vintage Omega pocket watches can help me with this one. I'm not new to the brand, but am new to their pocket watches.

Here is the watch in question, sourced in France with an nice intact porcelain dial and a French market "importe de suisse" marking at 6 o'clock.

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Watch is 48mm in diameter (minus stem). Yes, I know a movement retaining screw is missing, I'm getting that addressed.

I'd like to know what the case is made from. Would this be nickel-plated brass, chromed base metal, copper-nickel-zinc alloy (i.e. silveroid or similar), or something else? I'm assuming not stainless or it would be marked Acier Inoxidable (or similar) - correct?

The serial number places it around 1934.
 
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The movement in your watch might be a Omega calibre 38.5 which is shown on the Ranfft archive as from 1933 to 1949. Your s# fits that time period. The case is most likely a copper/nickel/ zinc alloy, rather than chrome or nickel plated brass.



If I may be so bold, the real nice dial on your Omega is NOT porcelain. Porcelain is an earthenware product used in dinnerware, pottery, and such like. Your dial is vitreous enamel! Basically, GLASS. A totally different material.
Edited:
 
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Not much I can add, the caliber may be marked on the plate below the balance but as noted, it looks like a 38.5 caliber.
The hands are unusual for an Omega and I quite like the style.

I have a watch with hands of a similar style. Not quite the same, but from the same "family".

 
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Thanks for the input everyone. It's off at the watchmakers for now.
 
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FWIW, I did get the calibre off the movement base plate - it's a 38,5L.T1.