Omega Pocket watch

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Found at the antique mall.
I can’t understand why the case is not marked what it is made of ?
White gold filled ?
 
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I suspect it's an electroplated brass case, possibly nickel silver going by the sheen.

White gold would have some form of hallmark.
 
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I’m leaning toward the nickel silver, it is really a nice pocket watch similar to my 18k Patek Philippe !
 
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Although the case isn’t marked with the name of the alloy, i think it is a patented alloy called STAYBRITE which was extensively used in the fabrication of many top tier Swiss watch case like Omega and Rolex, and possibly others.
 
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Although the case isn’t marked with the name of the alloy, i think it is a patented alloy called STAYBRITE which was extensively used in the fabrication of many top tier Swiss watch case like Omega and Rolex, and possibly others.

Staybrite is a stainless steel alloy developed in the UK, and as you note, used in many Swiss watch cases including Omega.
However, I would expect to see STAYBRITE markings on the caseback as manufacturers were quick to use the markings as a sales pitch.

For example:



I also think this watch may have been made for the French market due to the use of the old "belt/garter" Omega symbol and the "Fabrique en Suisse" marking.

Without having the watch in hand, my comments are just my opinion though.
 
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I’ve collected for 40 years, almost all cases say what they are made of ?
Why would Omega do this ?
The watch is fairly solid and heavy Beautiful deco style and etching on the edges ! Very much like my Patek Philippe
with breguet Arabic applied numeral dial hour markers. This had to be a higher end watch at the time ?
 
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Very few nickel plated cases for pocket watches. It's either 'métal blanc' i.e. nickel based alloy, or a staybrite produced before Omega advertised them as such inside.
I presume it is a ref CK395, which is contemporary to the first use of Staybrite by Omega around 1934.
 
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Very few nickel plated cases for pocket watches. It's either 'métal blanc' i.e. nickel based alloy, or a staybrite produced before Omega advertised them as such inside.
I presume it is a ref CK395, which is contemporary to the first use of Staybrite by Omega around 1934.

My sentiments exactly. The colour does not appear to me to be typical of a chrome plated case. It looks to me much more like Staybrite alloy than a chrome plated base metal case.
 
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Hello again,
I checked the similar watch I have. It is not a ref 395 (the OP watch has an hinge, ref 395 doesn't). I don't know the exact ref for this model.
Here are pictures (dial is different than the OP's watch but we know Omega used a variety of different dials on the same references) It all the same color as the bow, the reflection of the brown support tainted the color :
22010401502919182117737033.jpg
22010401503519182117737037.jpg
Caliber 35.5L T1 inside :
22010401503219182117737035.jpg
Nothing engraved about the metal used for the case but I am pretty sure it is nickel (too shiny and warmer color than staybrite) :
22010401503319182117737036.jpg

For comparison, here is a ref CK395, nearly the same case design but thinner bezel, no hinge, caliber 37.6 inside, made of stainless steel and marked as such :
22010402145519182117737040.jpg
22010402145219182117737038.jpg
22010402145319182117737039.jpg