PLUS ONE to Abilene. When re return to those Halcyon days of Yesteryear ... There were only .. one. 44 WCF was the one. Carrier Blocks at that time were not marked. Wasn't needed.
Then ..... however ..... in a spate of marketing genius, Winchester decided sales could be boosted by building guns in more calibers. Of course there was a call from some frontier folk for more and different rifle/pistol matching. Winchester was happy to oblige.
Then in a moment of astute realization, Winchester suspected there would be Morons whom would try feeding their rifles the wrong fodder. It is also surmised, those stalwart individuals whom couldn't remember what cartridge to feed their rifle, quite possibly didn't survive long enough to procreate (we hope).
Uberti, on the other hand, expects, since our ownership of their '73 does not necessarily represent maters of life and death, selecting the wrong cartridge will only elicit Mirth and Merriment obviating the need for a cartridge designation on their Carrier Block. Burma Shave