Interesting! I've got '55 and '53 Travelers, the '55 has a straight knurl like yours, but the '53 has a diamond knurl, which I expected yours might be. But while yours looks kind of like the '55, the lines on yours look different somehow, and the stainless rims don't have any knurling at all. All I can guess is that they were trying different variations over the years. These are the rims on the Travelers, see what you think.
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