K436, K437, K500, K636, K637, K646 Series Padlocks.
10,000 possible combinations. Heel and toe locking. CCL - Sesamee, "the padlock without a key" means strength and simplicity in lockig security. All brass internal locking mechanism, andd automatic "0000" stop. The combination is quickly and eassily set and can be changed any time by the owner - full instructions furnished with each lock.