Pretty sure it is, looking at it: 753 / wishbone stays / fillet brazing / logos in all the right places. They're the first compact geometry road frames ever built, apparently.
I guess it is then, the measurements I have kind of back up your theory.
"It measures approx 53cm centre to centre seat tube (59cm centre to top) and approx 56cm centre to centre top tube."
@Dry started
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Pretty sure it is, looking at it: 753 / wishbone stays / fillet brazing / logos in all the right places.
They're the first compact geometry road frames ever built, apparently.