Hey all,

I have a vintage frame that I estimate to be from the late 70s, early 80s. It was sold to me by my LBS owner in MA, and thinks his father got it from Pittsburgh PA, maybe made by a gentleman named Oscar Rattenborg. It was originally raw steel, never painted, never built up, but recently I had it powder coated and built it up with some parts. All I know is that it has reynolds stamped on the dropouts and the fork, as well as the lugs under the bottom bracket. Other than that, I have no idea what it is.

Is there a serial number anywhere on it?

No serial number on the frame. Just the Reynolds stamps.

I quickly googled Oscar Rattenborg, and he appears to be very much alive in South Florida and an active bicycle advocate. His bio on this site says he organized a racing group in Pittsburgh PA, so it has to be the same person. https://evergladesrogg.org/board-of-directors/

You may want to contact him directly.

The build looks fantastic BTW. The deep blue green paint color looks really great. The silver 105 components look great. What generation of 105 was this?

Lovely paint. Wow.

It's a mix of older 10 speed shimano shifters and derailleurs and a new 11 speed crankset. New ultegra wheelset.

2 bottle cages and under bb cable routing would seem to place it mid-1980s. Beautiful!

The OP indicated it is powder coat. They did a great job because it doesn't obscure any of the detail on the bike such as lugs, etc.

The frame looks extremely well made. The only thing that the builder didn't do was thin the lugs, but that helps it to keep the crisp detail even with a thicker coating.

Whomever made it, it is a beauty.

Very tastefully assembled. Good color choice on the powdercoat. Love those fastback stays and cluster. What's up with the pinch bolt?

Are those little holes on the driveside seatstay cap and driveside chainstay/dropout joint from pinning the joints before brazing? If so, the fact that they aren't filled in, coupled with the un-thinned lugs, points to an amateur builder.

Temporary option while trying to find a bolt that works.

Hello, I need help to identify this frame bought with moser fork...Could it be some edition of a bike brand named Professional? Have no clue where to start searching. All i have is the name of the engraving ''Professional''. Just registered on the forum so I cant post pics?