Sargent & Greenleaf, Rochester, New York - 4 movements, Model K, Model N and Model M

                                                           A

  B

  C

A. Model K, (later model #6404). c. 1900-1910. Uses same sized movements designated as 'L' as in their model 'O' quad movement, but has no drop bolt. Equipped with a trigger that would be used to actuate other locks or could be used with an external bolt actuation device. Notice the font style of the etched logo - a rarely seen style. Case stamped #3, consecutively number movements #2969 through #2972. file 109

B. Model N, (later model #6405). c. 1920-1940. Attractive slim model with S&G's largest 'M' sized movements. No drop bolt, equipped with a trigger that would be used to actuate other locks or could be used with an external bolt actuation device. Case # N-85, 'M' sized movements #1895, #1850, #1747, #1739. file 55

C. Model M, (later model #6406) c. 1920-1940. (later no. #6405) This is a rarer, super-sized version of the full sized standard model shown in B. Its dimensions in depth and length are the same as the standard model, but the case as well as the movements are an additional 1/2" high. The two comparison photos show it against the standard N lock as well as the two movements (3 1/4" x 2 1/4", and 3 3/4" x 2 1/4") . This may have been a special order for a particular type of safe model. The movement wheels in the larger movement are bigger and while I have not examined the spring, my guess would be that this is also stronger to enable these movements to push aside the extremely large bolt work in a "super max" vault door that would have been associated with this special lock. Case and bolt # N-66, specially sized 'R' sized movements #846, #847, #849, #851.  file 120