anywhere between 21 - 22.5 or 23" centre of crank to centre of seat pinch bolt
OK, let me try. I have a 1970s track frame with lugs, horizontal drop-out, road fork (alu fork, steel steerer 1").
I've had the frame for a very long time sitting in my garage.
It is an obscure brand - DHC iirc, made in South Africa by the manufacuter who dominated the scene at the time. The framebuildere and I were riding buddies. The tubing is whatever the premium tubing at the time was, Reynolds-something.
12 years ago I restored it, put on a a new Campag BB, new headset and a road fork. I never built it any further and it is sitting in my loft wrapped in lagging.
What may put you off is the track spacing at the rear wheel (but this can easily be opened to 126 or even 130mm), and the fact that the rear seat stay brace is not drilled for a rear brake.
Lugs are British racing green, body is creamish. The paint is still new but not super professional. I painted it in my garage.
The frame measures 56cm from centre of BB to centre of top tube.