Other prized collector's items were graciously loaned to me for copying. Bolsters are of brass or steel. None are marked in any way. A popular knife judging from the numbers still in existence. Light, sharp and useful.
Positive lock holds the blade open.
A pull on the ring pulls out the spring which unlocks the blade. Spring is mounted on back. Thong keeps blade closed and helps unlock it. Springless, plain but excellent steel blade. Copied from an original in our collection.