I put some time into reviewing the various attribution possibilities. There certainly are a LOT of possibilities. I agree and understand why DataDragon suggested coppercoins 1mm-005 and that could in fact be "the one".
But I saw others that could be matches but it's sometimes harder to tell because of photo clarity. I thought Wexler's WRPM -002 looks similar but the area inside the main 2 D's are a little fuzzy on the Wexler site. I see some similarities with other photos on CopperCoins although the "extra metal", that I assume makes it a D/D/D, does not show to the left of the main 2 MM's on those. The 050, 058 and 065 are somewhat similar, to my eyes at least, but missing the slight 3rd D to the left. I'm guessing that to an expert, this is no doubt an important observation to decide on as an aspect of the decision making.
Interestingly, on Wexler's site, the 1960 D WRPM-044 looks like a VERY close match on the D/D but again, is missing the minor 3rd D to the left.
After the holiday weekend, I think I'll contact Wexler, send photos of my example and see if he wants to have a look.
Here's wishing everyone a good 4th of July holiday!