As a Falcon the main triangle at least is pretty certainly 531 - rear triangle could well be also as would the forks.
Looks like a "traditional" 72 parallel light touring/clubman frame to me - mudguard clearance and slightly longer wheelbase.
Should give you a very comfortable ride if you fit the original 1 1/4" (28-32mm) tyres, (which are actually faster on ordinary roads anyway).
Heresy to say on here no doubt, but it would be a real shame to see that turned into a fixie.
@Giles_Pargiter started
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As a Falcon the main triangle at least is pretty certainly 531 - rear triangle could well be also as would the forks.
Looks like a "traditional" 72 parallel light touring/clubman frame to me - mudguard clearance and slightly longer wheelbase.
Should give you a very comfortable ride if you fit the original 1 1/4" (28-32mm) tyres, (which are actually faster on ordinary roads anyway).
Heresy to say on here no doubt, but it would be a real shame to see that turned into a fixie.