Originally Posted by
Hobbiano
Okay. I'm going to go out on a limb and say '82 720, base on double dropout eyelets, double water bottle bosses on downtube, no cantilever bosses, and really long chainstays.
I concur. The 720 was the only Trek frame that got double eyelets. Later production had cantilever bosses, and the final year they even dropped the double eyelets (labor-saving: we had to mill the dropouts and braze the additional eyelets onto them).