I'm a little confused. I thought Miyata made their own tubing.

Then I looked closely at the fork for this bike, and just as old and new said...its TANGE tubing. well at least the steerer tube is.

I brought it down to the LBS tonight and it needed a 27.0mm fork crown race, to which he was adamant, and I trust this dude, that it would take a Tange Levin 1" headset. and used the Tange stamped Steerer tube as further proof. We shall see wednesday.