That was my mistake..don't know my east from my west.
In early 1947 they bought into the Keynote plant which gave them west coast cover, then in 1948 they bought the defunct Majestic label's assets including a pressing plant for the east. I suppose that's what they called the Newark plant although they got rid of that in 1951.
MGM also did a lot of contract pressing for them.
I am a bit confused, though, that Mercury used a West Coast plant in Los Angeles for their East Coast clients when they owned another one on the East Coast, in Newark, New Jersey.
And I would still love to know where I can look all this up. Did you get all this information from Michel Ruppli's Mercury discography?
I did find Hank Fine's National Record Company (sic) in Los Angeles mentioned as pressing Mercury records in Billboard, June 18, 1955, page 17.
The label with the "glows" behind the head didn't turn up before 1948, and during 1948 Mercury were closing their Chicago facility and moving 14 presses to St. Louis.
By 1951 when this record came out they also used Hank Fines National Company in LA for East Coast clients and also their facility in Newark, NJ.
Mercury first added the "Non Breakable" text in May 1949 and stopped in Jan. 1951.
Moreover, the stylized head of Mercury is shaded on images 1300339 and 1300340, but not on 2564411 and 2564412, and the way the company name is listed at the bottom differs, plus 2564411 and 2564412 mention Merco Plastic. KeithS writes in the label profile that the shaded head may indicate a pressing by the St. Louis Plant, but I can't find any other source for that. I guess that means the other one would be a Chicago pressing.
There is at least one variant of the side A label. It has the entire song title including the subtitle in a single line. Patti Page's name is in a different font in the artist credit than the other print on the label, having serifs where everything else does not, and it is on a single line by itself. Also, the publisher is listed as Walt Disney Music instead of simply Disney Music. Patti Page's name is not listed under the word Vocal at the 3 o'clock position. Finally the words "with Harry Geller's Orchestra" are replaced by "accompanied by Harry Geller And His Orchestra".