Stumbles on this video. The Andrews Sisters recording Boogie Woogie Bugle Boy for a V Disc. The end of the video shows cutting room with 4 Presto lathes. It looks like they're cutting 16" at 33 1/3. I always assumed they would have run at 78rpm in that era.
https://www.youtube.com/watch?v=oyR97d9hi84
Re: Andrews Sisters recording V Disc - 4 Prestos
By the time of that Andrews Sisters' session, some recording companies - namely Columbia but, as of 1947 when Bing Crosby cut his second version of "White Christmas," Decca - recorded individual tracks simultaneously on 16" 33⅓ RPM reference acetates (vertical-cut, I.I.N.M.) as well as two 78 RPM lacquers for sending to the pressing plants. This would be a boon to Columbia at the point they introduced the LP record in 1948, in the years before the Ampex 200 magnetic tape recorder first appeared in recording studios in 1948-49.