I don't believe I've ever seen a gun with that many Remington repair codes on it --

ED3 = Oct 1935
WE3 = Aug 1936
EJ3 = Oct 1940
CL3 = Apr 1942
LZZ3 = Feb 1953

That many trips to Remington and most of the screws are not properly indexed?

Looks like maybe gave up on a Parker single trigger and had a Miller installed.

That Ithaca Gun Co. recoil pad with the aluminum base was introduced in 1950.