Not having previously bought any 1930s UG, I bought three in a week. Here are two with gold cases and gilt dials.
Ref 5576, Serial 613xxx, Cal 255
Bears a striking resemblance to the Patek Ref 96
I'm not certain about the other hands but at the very least, the minute hand has been replaced.
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Ref 5335, Serial 620xxx, Cal 247
This seems to be the ladies' version of the UG 'Prince' retailed by Hermes in the 1930s. See lower centre of advert copied below courtesy of Sala.
The men's version was I think 29.5mm, whereas this is a diminutive 22mm.
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I would not be at all surprised if this version was also retailed by Hermes. The buckle, which I think is original, seems to be identical in style to the buckle I've seen on a men's version. It has the eagle's head French hallmark for 18k gold along with another mark I don't recognise.
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