Recently, we have been re-evaluating a 1925 Pater watch record which was reported to have a 19K 1/12 Rolled Gold Plate hallmark as part of the inside case back markings. The watch owner didn't have a picture of the inside case back, so we sent a private message to confirm the gold content hallmark.
She wrote back, with confirmation of both the gold content hallmark, and case serial number being correct as entered in root record.
Has anyone seen a case hallmark that includes the "1/12" part? I did a global site search, but I only come up with the Pater example, and a bunch of links to watch bands/bracelets.
For some history on this discussion, I'm going to paste other comments into this thread.
There is a 1924 model 158 watch record, and the photo of the case signature may include the "1/12" hallmark in gold content description, but that part of the case hallmark photo is too blurry to make out.
I had asked member Bobbee if he thought this photo above included the "1/12" in the blurry part, and his reply is below: