Shoelaces cutting knife by O.Langenhan. The knife is new old stock and was made before 1945 in Schmalkalden, Germany.
To cut leather shoelaces made of veg-tanned leather, a hole is cut in the middle of a skin. The knife is then used to cut endless cords from the inside out. Pull the shoe lace trough the knife and keep the hand with the knife fixed.
If you have any questions or special needs, please ask.