French M 1842 bayonet .(ABCN1734)(K 453)(JN 68-3))

French Carbine M 1842, M1846, M 1853 and M 1859. Serial number: 580 on the crossguard.  EXC- bright finished fullered yataghan blade. The blade shows very fine peppering,  mainly in the right fuller only. No blade spine inscription. Left ricasso is stamped L 75 over 20. Right ricasso is stamped with two crisp French inspector markings: Star over B in an oval and Star over M in a laurel wrath in a circle. Excellent brass hilt with a blued short external spring. T-slot in pommel. Mortise slot is marked: X 23 and crossed out 18 A. Bright finished crossguard with back swept quillon and muzzle ring. MRD 24 mm. 
Excellent blued metal scabbard with no dents, but it is missing its steel belt frog loop.