Guess the manufacturer

dogsballs momentum, doubt it is that old. they usually have the grease ports on the BB and head tube from that era. plus it has very plain lugs, so my guess it's a budget frame from 60's.

Oh you looked at ALL the photos - that's cheating :)

You're right on the grease ports etc. The lugs are pretty rubbish looking, but some old (eg 30s) frames used these kind of lugs but were ok frames for the era. However, most frames that used lugs like these are bottom of the barrel and the other photos, especially the seatstay bridge, make that look like the obvious option, as Roberto says in the auction.

In the spirit of the other posts, I think it's probably a Ben Dover from Peckham