Judging by the geometry, probably dates back to the 1960s. It's in a fair condition for it's age and looks to have been resprayed at some point and had new decals applied. The BB threads have been chased and are clean. Standard English (BSA) 68mm BB shell. It has a Tange Levin headset fitted which is included in the sale.
57cm c - c seat tube measurement
57cm c - c top tube measurement
Based in North London.