Glad you asked, both sides of that cover (front AND back) have modern phototypesetting. Also notice, on the top right of the back cover {Image #3554972}, "1024" inserted. Notice how it's in a different font from the "JLP."
F.T.R., the front cover's type also screams "1970's phototypesetting." There were a couple of alternatives to Harris and to Linotype - I wonder if this was Alphatype's version of Times New Roman Bold. (If not them, whom? Any 1970's phototypesetting mavens on the boards here?)
W.B.lbl, does your comment apply to the front cover print? If so, then I suppose it must be a clever fake after all. If the comment applies to the back cover only, that back cover image is actually probably from a bootleg - it's not from the same source as the front cover.
This does seem like a bootleg - especially given the use of a phototypesetting version of Times New Roman with Bold that was in use in some printing houses in the 1970's. In short, this would not have been made in the '50's.
This LP has been bootlegged, and it might even be a clever fake altogether, but what makes me doubt that is that some of the choices for cuts are definitely not ones the main group of Orioles fans would ever pick, so I do think genuine mid-50's copies exist.
Even the red plastic doesn't bother me, as LP-1016, which should be fairly close in time frame to this one, comes on red plastic.
On the other hand, what worries me is that this LP is not documented anywhere at all, except via its few sales captured at popsike. That is to say, specifically, it is not listed at Discogs, not listed in Jerry Osborne's "Rockin' Records", nor in Tim Neely's "American Records".