Help! UG Uni-Compax

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Hello everyone!
First post here!

I’m Mateus, watch lover (especially Omega Speedmaster) and I would appreciate any info about the UG below!

As far as I know, it’s from 1936 to 1938 (according to the serial number). Unfortunetly the caseback was polished, so there is no reference number.
It is a Uni-Compax with caliber 285.

Thank you!
 
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No reference is needed- these older ones didn't always have a reference. It looks good and original. One of the first uni-compax' ever made.

Edit- case mismatch pointed out by the eagle eyes below😕
Edited:
 
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Hi Mateus, welcome to the forum. In the third photo you posted, the fit between the mid case and case back looks completely wrong. The caseback appears significantly smaller diameter. I would want to clarify this issue before considering a purchase. Also, the chronograph sweep hand looks wrong.
 
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Hi Mateus, welcome to the forum. In the third photo you posted, the fit between the mid case and case back looks completely wrong. The caseback appears significantly smaller diameter. I would want to clarify this issue before considering a purchase. Also, the chronograph sweep hand looks wrong.
+1 looks like somebody went at the case with a Dremel.
 
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Hi Mateus, welcome to the forum. In the third photo you posted, the fit between the mid case and case back looks completely wrong. The caseback appears significantly smaller diameter. I would want to clarify this issue before considering a purchase.
Ah didn't see this. It does look like case back isn't fitting the case. Pass on this watch.