The '72 Competition I have in house has the same Reynolds decals as Narhay's. As far as stays go, they look like the same ones that are on a (believed to be, painted over) International from '74: "rapid taper" type chain stays, and similar seat stays, kinda chunky at the top with the flat oval caps.
The "International" frame & fork weighs 3.1 kg, the Competition nearly 100 g more (both 62 cm), though the "International" has top tube that's 1 cm shorter.
I'll check the head tubes tomorrow.