Originally Posted by
unworthy1
The other detail is the dropout, which I think (and JDT can confirm, cause he knows his DOs!) may be a Shimano "UF" semi-vertical?
The rear dropouts are either Shimano UF or Gipiemme 1800AX. The differences are subtle, and not obvious in the OP's picture, but I'm leaning toward Shimano UF.
Shimano UF:
Gipiemme 1800AX: