Just now I saw Walt's PM concerning a discussion about this subject.
Yes I was the person who wrote about RCA Victor matrix numbers as discussed https://secondhandsongs.com/topic/75011?offset=0#m192127.
But I wasn't the person who added the recording/ release dates to 45.cat.
Personally I am very cautious in using recording/ release dates from the "internet".
I am relying more on "paper" sources, like all the work of Brian Rust, the "king" of discographers.
So, Jon, I can give you an exact answer to your question about this release: http://www.45worlds.com/78rpm/record/36623
Brian Rust gives a June 5, 1942 recording date for Harry James' Columia-release (#36623).