Originally Posted by unworthy1

Might be a small builder like a RonKit or MKM contractor. Looks like a nice older Brit frame that's been resprayed and had newer components hung on. I'd guess later than mid '50s (tho it's possible), and could even be as late as '70s, you reckon the shifter bosses were added on when painted?. Whatever it is, looks to be a high quality frame (Nervex pro lugs) and probably all 531...show us some more!