Being left handed, I can load a 37 from the bottom easier than I can load an 870 through the loading port.
Reverse the safety and you have a true, left hand gun.
I had the dsafety reversed on my 20 gauge 37 before I even shot it. My 16 gauge 37 had a left hand safety on it when I bought it from a pawn shop. I actually got a discount because it was "wrong handed".