Okay, I don't feel bad about posting this (tangential) question:

The reasons for asking this are complex and embarassing, but will a Miche Primato 1" threadless headset work in a mid-70's French frame (probably St-Etienne region build)? Tubes are 531, but the label indicates French sizing. I *just* got it back from Wyganowski's shop yesterday and haven't really had time to check it over. I just know that there may be some tube-size variations.