The good news is I found it, the bad news is it's a 13, sorry!
I was a bit surprised by the idea of a 12T DuraAce. Suntour used to make a 12 when they still existed and made track parts, Sugino do a 12T too.
@gbj_tester started
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The good news is I found it, the bad news is it's a 13, sorry!