Did Cinelli ever make any frames for Trek?
 

Seems highly unlikely to me. I asked the eBay seller about the serial number on this frame:

https://www.ebay.com/itm/164532089888

The seller's response was, "07fA00 i had to sand it down a little the frame set was made for trek by cinelli."

Any truth to that notion? Looks like a typical early 80s Trek 500/600 to me.

https://i.ebayimg.com/images/g/9UsAA...D4/s-l1600.jpg

Doesn't match what this says for a Trek 970.

Trek Bike Models by Year and Color

I have seen that color scheme before though.

No--but Trek did build many of their 970 (Columbus tubes) and 770 (Reynolds) frames with Cinelli BB shells.

Ahh... I had considered that, but immediately discounted it as I didn't think they used Cinelli bottom bracket shells.

'82 950 pewter with blue panels

Thanks. I see 957/959 in the '82 catalog, but no mention of a 950. The brochure says white with blue panels, though I see the vintage-trek.com page you referenced says pewter/blue. How would the 950, 957 and 959 have differed? Maybe same frame, just different components?

950 is the frame. 7 and 9 are build packages.

Trek's early years had this numbering system. A "0" (zero) at the end of the model number indicated it's existence as a frame, while any number from "2" through "9" would indicate, as Ex Pres said, the build package. The higher that number, the nicer the components. Take a look through their early catalogs. 1983 was the first year they changed the system to a more "what you see is what it is" label/numbering system.

Overall, Trek's three-number model naming was quite logical and easy to follow. The first number was overall rank/quality/tubing type. The higher the number, the better the spec. The second number was the bike's purpose (regular bicycle, touring, or racing). The third number was the build package (general examples: 2, 3 or 4 was mixed Dia Compe, Sugino, etc; 5 or 6 was Shimano 600EX, Cyclone or similar; 7 or 9 would be NR, SR, or Dura-Ace).

Mine as it came to me.

https://cimg9.ibsrv.net/gimg/bikefor...4c17601f61.jpg

Mine is in the stand right now being taken down and rebuilt. I just checked, my bottom bracket is Trek, not Cinelli. My serial number is 017625 putting it as a 1982 build. Vintage-trek.com shows the 950 frame as coming in silver with dark blue panels as a 1981 and 1981.5 model year. The 957 (Campy equipped) was listed as white with blue panels. The 959 (Dura Ace equipped) was listed silver with dark blue panels for 1981 and 1981.5. I assumed mine was a 1981.5 model and started as a frame only. Who knows though?

The price for the OP linked bike seems maybe a bit on the high side for the market, but not at all unreasonable. I suspect if this was an auction it would end in the $300s. The serial number doesn't look right though. The eBay listing indicates a 1977 frame. That seems too early. Maybe the second 7 is a 9 for 1979?

As hazetguy mentioned, these are sweet frames. They get lots of attention too. I have had many riders on everything from vintage on up to modern carbon, high end bikes admire and comment on my Trek.

If I was in the market for a new frame, I would have snapped it up (seller offered 300). I rode an '83 760 as my only bike for over 20 years and am currently Trek-less, but I have enough other bikes that I can't all ride.

No, but Trek did use Cinelli bottom bracket shells and fork crowns on early 750/770 and 950/970 frames, which are used on the frame in question. Later production used TREK-branded Cinelli bottom bracket shells, and after that Trek's own shell with the cast-in cable guides.