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?

Looks like a 510, Ishiwata frame and fork, touring geometry. They also made the 530, same tubing in racing geometry. That's a later one judging by the stickers. I think mine had SunTour dropouts.

Ishiwata tubing and campy drop outs; I haven't seen that before.

Looking for that color in the early catalogs might help. As I recall, they used only a few colors per year, maybe one color per model. If my failing memory doesn't fail me here, that color was called Chestnut.

Yes, it is Chestnut. Color doesn't help as much as I thought, from what I understand earliest years you had option of color, then Chesnut was one of two options. So I believe it could be that color, any of the year options.

I only see that as an option in 1980, which is what I think this must be?

edit: 1980 specs: https://www.vintage-trek.com/images/trek/Trek80.pdf

Didn't know about the 530, this one is definitely not racy, so 510 fits. The decal on mine is "later" because it has color behind the lettering correct? Older version would just be letters? I am assuming the seattube decal is a replacement, seems newer and is peeling in at the top in a way I wouldn't expect from a vintage one.

I'll buy that identification. I haven't seen ishiwata Treks with campy drop outs before. The full Ishiwata Treks are very nice bikes. I had and rode for some time a full Ishiwata Trek, a 1979 510.

Came here to comment on the seat tube decal likely being unoriginal. 510 seems like a good match.

It helps a bit.

If you figure, through 79 you had the letters with no wrap on the seat tube, and screws in the head badge. So it's a good bet it's 1980 or later.

Then if you figure the 1982 catalog shows the 510/515 with the color options- neither of which is Chestnut. So you know it's earlier than 82.

So 80/81.

Love how the headbadge barely fits on that little baby headtube.

Hadn't considered (lack of) headbadge screws! Funny, because I helped someone else narrow down a frame year with that same info. Seems to be more confirmation of 1980 since '81 would have Shimano drop-outs and SCM 555 investment crown. 1980 should have Trek "internal tang" fork crown

found this:
https://www.vintage-trek.com/Trek_gallery710SE.htm

captioned: "Underside of fork crown showing the reinforcing gusset. In the 1980 brochure, this is called the "Trek integral tang" crown."

That's the fork crown that was used 79/80 and matches mine

Pervy upskirt shots.

Ishiwata 022 is what was used on the 5nn series frames.

My thoughts, as well.

Do the colors (frame and ST banding) reveal any clues? Usually they do, at least in the early and mid 1980’s. The chain stays look a bit long, and that was a characteristic of the later 1970s. Rear wheel looks like a 5 or 6-speed, so the rear OLD could be 120, 126 or 128,

Some closer pics with a well-focused side elevation with a lot of pixel detail, and a close-up of the frame tubing identification, would all help. I’ve found it really rare that a number cannot be decoded.

Also show us the number in the actual point to see what the actual number could be. Maybe we just need to unscrew a shift wire guide plate screwed onto the bottom of the BB shell. Or, does the fork steer tube show an SN? Usually the numbers on the steer tube are pretty darn clear.

But I think this frame being small, triple-capable, and a well-specced build, could be in the more-desirable category, not to mention the paint is in decent condition, as far as I can see!

I’m certainly no expert but when I see drop out brazing like that, I think 6 or 7 hundred series Trek.