Originally Posted by
jetignacio
I see, so meaning this frame that I have belongs to the early 70’s era of frames. Good to know that. Thanks for the inputs!
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