This is a knuckle knife from early in the war and was reputedly made for the British Commandos prior to the introduction of the F/S.
Obviously based on WW1 knuckle knives, it was produced with the grip cast in either iron or brass.
My version is cast in brass with a blade 5 1/2" long and a cowhide sheath
$140 plus $5 shipping.
To order e-mail me.