From what i know some miele were built by colnago, actually are pretty under rated bikes and I have not seen a single one that you can't tell is not italian racing geometry. Like them way better than some trek and specialized from the same era, better finishing and way more racy looking even in the low end models.

Anybody has one of this frames to give away like in 55??

As for the OP, you have to measure, to have a caliper at home is mandatory but depending on the tubing could be 27.2, 27 or 26.8 (japanese tubing is 26.8).

Enjoy the bike