Lever Padlocks - Prototype/Experimental

Click to Enlarge Image "DUPLEX" - Prototype. 3" high. Brass case. Brass shackle. Mfg by: Yale & Towne Mfg. Co.
This was the first design attempt of the Duplex lock. A couple changes were made to the production lock. First, the keyways were moved farther apart because it was hard to turn the keys with them so close together. Second, the keyways were redesigned so that the keys would only go in the proper keyhole. 
6810
Click to Enlarge Image Eagle Lock Co. - Prototype. 3 3/4" high x 2 1/2" wide. Steel case. Laminated steel shackle. 4 Levers. The patent shows 1 lever with 1 guard lever. We have not found a lock that matches the patent as yet. Mfg by: Eagle Lock Co. The Production lock is hereUS Patent #555728.
"The Jeff Strumberger Collection"
7582
Click to Enlarge Image "HOVERS NO3 XXX". 3 1/2" high x 1 1/2" wide. Brass case. Brass shackle. Possibly Prototype/Experimental. There is a hole in the side of the case where a pin is inserted. See patents for illustration. Mfg by: William Hover.  US Patent #347711 US Patent #471482. 3409