Hey all, I've been working on my Mystery Frame and figured I'd post what I found in hopes someone may recognize what I haxe. On the steering head, seat tube and forks there is the letters RRB in a circle, On the down tube the same letters are there followed by a word I can't make out. It looks like the first letter is a G or C and the fouth is possibly a lower case L, or maybe a lower case d, b, or t. The BB shell is Cinelli, The dropouts are Campy and it has Super Record Crank and FD. I'll post some pics, but there not very good. The frame is Lugged steel and is very light, When I tap the tubes with a fingernail, it makes a higher saound that the ChroMo on my Giant, and they seem thinner. Reynolds, Columbus? Any help would be appreciated, I heard there was a builder in Chicago that went by RRB, but I haven't found anything on him.