On the bottom of the label, the concentric rings just about to touch the RCA "meatball" logo. Here is the guide to how to identify 78 pressings on RCA Victor as in effect from c.1946-47 to the 1949 closure of the Camden, NJ plant and the retooling of the Canonsburg, PA plant to all 45's (the Indianapolis and Hollywood variants remained, through the 1954 switch to the four-color Nipper "black label, dog on top" design).
Correct on both label sizes. It's interesting to see how you find the date of the round label repressing, too :)
Out of curiousity, what gives away the Indianapolis pressing on the 1940s issue? I know that the scroll label i posted is from a record pressed in Oakland...
So that was the little game of Victor - after the Victrola line was discontinued, back catalogue product was shifted to RCA Victor Red Seal. It looks like {Images #859760 & 859761} - whose label size looks like the 3" standard which all 78 manufacturers were using by that time - was pressed between the renaming of the label as RCA Victor in 1946 and the disappearance of the "Manufactured Under U.S. Patent 2130239" notice in 1947 (and in Indianapolis, IN, I might add). I have to reckon the original {Images #859758 & 859759} had 3.375" labels.
There is no specific listing of this record in archive.org's Talking Machine World collection, as perhaps McCormack had gone out of fashion somewhat ("With all due respect to the Carusos, the Plancons, the Scottis, the McCormacks, the Tetrazzinis, the Galli-Curcis, the Macbeths and
the rest of that brilliant galaxy, there was, at one time, just a little too much insistence upon
them. But to-day all that is changed." - TMW, August 15, 1926), or perhaps it was released out of sequence earlier in the year (archive.org do not have TMW from the first half of 1926 available). 1170 is listed for October, 1171 for November, and 1178 and 9 for December, so I have inferred a date of November from this.