Sorry if my measurements are not what is expected. I used a Mitsutoyu caliper that has both inch and metric scales but is analog and reading the scales in metric accurately is difficult. Perhaps if I had a digital readout it would be more accurate.

Thanks for all the feedback anyway. For now I will assume it is a British made frame from the late 60's or early 70's. Unless it is something very special no one besides me will probably care who made it. It will be repainted and sold by the bike exchange, probably for a couple hundred bucks and someone will get a very nice very light bike that they can enjoy.