Look inside the carrying case for a maker's mark and also a marking on the zipper. Nice originals are worth at least $75 - $100. I see SA (Springfield Armory) markings on your bayonet lug and the trigger housing. The trigger housing has the M2 cuts and is called a Type 6. I think that front sight is a Saginaw. It looks like your trigger housing attaching pin is inserted in the wrong direction. I had a Type 5 Inland operating slide with the same numbers on the bottom as yours, but with an O instead of an L. You'll probably find Inland markings inside the "box" on the slide. - Bob