This is a really cool vintage 1930′s (I think) 6 day racer track frame. I’m not sure who made this but it’s really nice quality for it’s time. The frame is fillet brazed with a lugged fork. One cool detail is the top of the chain stay’s are open, a collector once told me they did this to prove to the consumer that it was made of lightweight thin hollow tubes and not cheap thick wall tubes. At some point someone repainted this with a metallic green which is somewhat of a shame. Having a nice weathered patina would be better I think. The seat tube on this is 52cm measured center to center. The top tube is 55cm.