Originally Posted by
Miele Man
Not necessarily. I have a 1985 Miyata Seven Ten that has double butted tubes and only the braze-on water bottle mount on the downtube. Apparently the next year, 1986, saw them go to triple butted tubes and an extra bottle braze-ons on the seattube.
Cheers
I see, so it depends really on the frame makers. Mine has no markings, I only see the Campy marks on rear and front dropouts.