You do see very small single marks on the backs of lugs etc but never the full triangle or model number etc. This being a local US made case will play by different rules anyway. Dennison cases have small external marks. This watch is circa 1957 by the way, I think Foo made a typo above. I have something similar in an 18K Swiss case. It all checks out correct for a US version of the 2846. It is tricky to be sure but I do think that is a redial.
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