Only track forkblades are 22 mm, and quite thick wall, thicker than any chainstays (1.4 mm in the case of 531, versus about .8 mm for stays)
Reynolds older, skinnier oval, that they called Continental, started out as about 23 mm (probably some fractional inch size)
The fatter oval we associate with Columbus, almost exactly the same as the current Reynolds "New Continental", starts out as 24 mm.
A 24 mm chainstay will not fit over the spigots of a lugged shell, its the same size as the spigots. You could make a butt joint but that's not what Tesch did. It takes 1" (25.4 mm) round tubes to fit over the spigots of a trad lugged shell for 7/8" c-stays.

Check out the pics from BMC_Kid , they show how the stays make a step down in diameter at the dropouts. Those are lugged dropouts, with sockets intended for the stays to go inside, but Tesch used such large stays that they fit over the sockets, just like at the BB. Amazing. Brilliant if you like 'em stiff. Too stiff for me, but I'm only a clydesdale sprinter who never won beyond Cat3 amateur.

I made steel sprint frames for Ken Carpenter who won USA Natz 4 or 5 years in a row, went to two Olympics ('88-'92), and turned pro. For his chainstays I used 1-1/8". He'd had custom frames from Masi and Serotta before mine, and he said mine was the first frame he ever rode that was stiff enough. Later he was on a team sponsored by Merlin, and he tried to like the frames they made for him, but they weren't even close to stiff enough. His review of their first attempt wouldn't be printable here. Then they made him one which they insisted was "twice as stiff" as the first one, and it still failed miserably. So he continued to ride mine, painted to look like titanium, with Merlin decals on it.

Sorry, I know I've told that story here before, I hope no one's getting sick of hearing it. I sure ain't!

Mark B