Sargent & Greenleaf, Rochester, New York -
4 movements, Model N and special order N
A. Model N, (later model #6405). c. 1910-1940.
Attractive slim model with S&G's largest standard '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 dogging
device. 4 1/8"h x 10"w x 3 1/8"d. Case # N-85, movements #1895, #1850, #1747, #1739.
The components of both the 72, (left) and 96 hour, (right)
movements are identical. I have examined all of the individual wheels as
well as the spring barrel diameters and they are all the same. The planting
of the wheel works in the 96 hour movement are spread out a bit more in the
vertical direction to take advantage of the taller movement plate. The
spring barrel sizes are identical.
B. Model N, (later special order model #6405) c.
1910-1940. This is a rarer, super-sized version of the largest sized
standard model shown in B. It has an extended duration of 96 hours
verses the standard 72 hours. 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, but most likely was ordered for a bank vault outside the United
States since major banks in the US did not close for more than three
consecutive days and a time lock of this size would only have been used on
the largest commercial vaults of the day, and not a private vault. 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 have the the extended duration that would have been associated with this special lock
as well as to operate the larger automatic bolt motor associated with the
The additional 1/2" of movement plate height allows dial indicator hand to
be positioned at the top rather than attached to the left hand corner
movement pillar. This is the only example I've seen of this special order 96 hour time lock.
4 1/2"h x 10"w x 3"d. Case and bolt # N-66,
specially sized 'R' sized movements nearly consecutively numbered movements #846, #847, #849, #851. file
Last photo below shows what appears
to be a Sargent and Greenleaf type Model N time lock in a large vault door.