This is a very rare 1920s Remington umc radio knife. All blades are stamped.punch blade snaps both ways. Sheep's foot snaps opening but slow on closing. The locking screwdriver locks in open position and to close screwdriver you need to depress sheepsfoot blade. Knife measures 3.80 long in closed position. Bone handle has hairline crack at front center pin. All bone present and tight. Back handle bone is very nice with no cracks or no patches. Thanks for taking a look.