Pete,
The locating spigots in those tins are fabricated sheet steel with threaded inserts. The 'tapered inwards' legs on the rear assembly I've only seen on these repro scope tins, never on real ones, at least, as far as I can remember. The chap who runs AAS, I am told, has a Vietnamese wife & extensive contacts over there, & that is where a lot of his repro stuff is made. However, I can't confirm if this is true or not.
Some years ago nobs Dave & I bought a few of his tins as he quoted us a good price, & we tore out the spigot assemblies & replaced them with ones our machinist (the late Graham) had made properly. (We just riveted them in & refinished the tins).They were ok after we'd improved them a bit, as the basic tin pressings aren't that bad IMHO.