1) Unknown Socket Bayonet. Collar numbered "12987. "6" and a roman numeral "II" marked on the ricasso. OAL:21" with a 17 3/4". 2) Unknown Socket Bayonet. No apparent markings on the blade, ricasso, or the collar. OAL: 21" with a 18" blade. 3) US marked socket bayonet. Locking ring absent. OAL: 21" with a 18" blade. 4) US Remington M1917 Bayonet with sheath. "1913/9 17/Remington circle logo" marked on the ricasso. British style proofs slashed out, multiple US stamps on the other ricasso. OAL: 21 3/4" with a 17" blade. 5) US M4 bayonet with sheath. Utica marked on the guard. OAL: 4 1/2" with a 6 5/8" blade.