It's a nice gun Jon at an excellent price! I looked in my records to see if I could verify that I could find a '53 ЛH prefixed gun.
While I found several '53's, my results were not quite what I had hoped to find:
Unfortunately, they are *all* '53 Tulas, not Izhevsks.
Not to fret though, your gun is most certainly an Izhevsk, the 4 on the receiver is distinctly Izhevsk and the font has the correct wide aspect ratio. It's a darn nice looking one too!
Hopefully one day an as-issued '53 Izhevsk turns up with this prefix and we can put this one to rest 100%.
Nice snag!