I think the second is late WWII and the first is post war. Id wait for more insight though.
When buying a carbine bayonet, remember that they were not produced until the very end of the war, so most of them are post war.
First one has been messed around with - or is a copy, but the
second is ok. The M4 bayonet for the M1 Carbine replaced
the US-M3 fighting/utility knife in 1944. The M4 above by
Utica Cutlery is a very nice example.
Someone has unwound the tie down, but it can be
i love the second one it is a very nice knife !! the first one though i have no idea on it !
The 1st bayo looks a lot like the M4 bayos I've seen come out of the CMP surplus (US). what I've heard about them is that they are clones made in Greece for the lend lease carbines. They are usually unmarked with a paint like finish and that ugly thin grip. Not sure if its true or not but that's my guess.