Treks are usually pretty easy, the Vintage-trek.com site gives you a wealth of resources. This was an early acquisition and I thought I had identified it? But now revisiting what I had written down, it is wrong. Serial number is very hard to read (which complicates things). Serial starts with "F" which puts it into the "exceptions" category. I think the Campagnolo drop-outs are the key detail, but curious to hear what smarter folks have to say?
I am thinking based on the "F" start of the serial # it is a 510. and based on Campy dropouts 1980? I looked at the catalog pages for 1978 - 1981.5, only the 1980 had Campy dropouts - 1980 Spec should be Campy 1010 Record w/ eyelets - Nikko Sangyo long point dropouts & Trek internal tang 4130 Fork Crown. Does that fit with what we see here?



Serial # F1E3?44 - can't get a clear picture
Under "Year Exceptions" in the Serial # section of Vintage-trek.com:
"B. Serial numbers for four model 510 frames (with a leading F) have been reported that have similar unexpected year dates. (Our thanks to Rich Ferguson, Fred Gomez, and Chris Tank.) The fourth characters are 2, 3, 4, and 5, there may be more. The frames have the early TREK graphics on the seattube. These frames may be related to the M and N leading serial number bikes in the section above." So the "3" in my Serial is not indicating year, which would mean it could be or is a 1980?