Great find at a terrific price! 

BTW, What you have is an American Fork & Hoe made WW2 M1 bayonet from 1943 or later. Prior to that, the US cut down WW1 & earlier (1905) Springfield Armory & Rock Island Armory bayonets in addition to early WW2 bayonets made into 1943. There may have been an overlap in blade length, but they decided that due to changes in strategy, along with going from a bolt action m1903 to the semi auto garand, that a shorter bayonet would work better. They cut down previously full length M1905 bayonets in various point styles, including earlier WW2 produced. Yours is the later, non cut down, known as the M1. 

Sad, RIP.

Found these at a local antique store and couldn’t pass them up after seeing the stamp on the back.  Both seem to be in original frames. After some research not much turns up on photos like this so not sure of rarity or value but very unique regardless.    

Yes and no. No doesn't really matter as long as they work well and are used for what they were intended for. Yes, it matters to potential collectors. Reproduction, be it magazines, parts, slings etc., are fine as long as these are not being passed off as being100% original USGI. Of course, potential buyers should always do their homework/research before making a purchase of firearms, parts, magazines, slings etc. No different than buying expensive watches, jewelry, clothing. Know what you are buying.    

Sorry about it being upside down 

The US Navy jumper is really nice !

This is the one my son just got presented

Thanks guys !!

Iirc, I'm almost positive they went to a different acceptance stamp at some point later on with stars or something (I'd have to pull out some m5a1's and early m7's to remind myself), but I always thought the large version of that symbol embossed into the narrow end of ww2 ammo cans looked really cool. I've got a couple rusty ones around here somewhere.    Reproduction stuff can have it, and things like Vietnam era USGI M4 bayonets may not, but it can somewhat help id GI WW2 vs commercial market on some items. Then again things are found missing it or lightly stamped too.