Hi list members, I also have a RRA frame set bearing serial numbers similar to Dmitry's. The numbers are stamped on the bottom of the B.B. shell just inside of the adjustable cup end.{ oriented along the plane of the wheels} They read 50528 with the letters B J just below. My RRA is in original {rather weathered } finish and decals . Brittle light silvery blue/green over a much tougher gloss black undercoat. I think it dates to 1953/4 as the ft. and rear dropouts are not chromed . Typical of many products from this era due to the Korean war nickel shortage. Otherwise it is much like all the other RRA's I have seen.
Greg Lone Langley B.C. Canada
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