BC41 Knuckle Knife.
A wonderfully sleepy example of the BC41 Knuckle knife. Reputedly issued to Commandos prior to their issue of FS knives, the design was heavily influenced by similar knives produced by some Sheffield manufacturers during WW1.
This example has never been cleaned and has staining and minor corosion all of which can be straight forwardly removed if you had a mind. Evidence of the blade having been sharpened. The sheath too is in similar dusty, uncleaned condition. Altogether an excellent, untouched, sleepy example of a famed pattern of a fighting knife.