I have a few bayonets; for my Enfield, Mauser, Garand, M1A, AR15. I was at a weekly flea market here in Kuwait and found what appeared to me to be a WWI era Mauser bayo, wooden scabbard, in great condition. He wanted 22 dinar ($72) but they always want to hose Ameriki. He came down to 16 dinar ($52) but I walked away thinking I'd bring my filipino gf back and she'd get it for a song. Never seen the dude again and I've been kicking myself ever since.
I've walked away from a couple Martini-Henry bayos and regretted that too.
The bayonets preceeded the knives but only as accessories for the rifles.