Circa 1960-68 Flexible Flyer model 51J sled. Manufactured by the S.L. Allen & Co. at the original location in Philadelphia.
Single owner -- this was my sled as a kid. Used, of course, but in pretty solid condition, including the logos and lettering. Note that the wooden top rail over the right side runner was replaced after the old one broke. Otherwise it has all original parts. Nice vintage display piece, or a little TLC would get it back into sledding condition (if it ever snows around here again!).