c. later 1930's. Around 1902 with the sale of E. Howard &
Co. to the Keystone Watch Case Company, E. Howard exited the time lock business.
Therefore, the time lock companies that used E. Howard shifted to Seth
Thomas movements. Mosler, however, did not begin manufacture until 1915 and
chose 18-size Model #4 pocket watch movements supplied by the
Company. After 1932 Mosler switched to American Waltham Watch
Co., Waltham, Massachusetts, 16-size pocket watch movements which is used in
this example. The movement used a snap ring around it to allow it to fit
into the larger opening which accommodated the prior Illinois Watch
movement. The movement featured a larger setting dial and it appears that the 120
hour duration was standard on this version. The movements had a separate crystal covering the watch movements much like on a
conventional pocket watch providing exceptional protection from contamination compared to
other time lock movements that did not rely on a pocket watch movement.
Time Lock Co. was another company that used movements supplied by Illinois Watch
Company and Yale's Models
B through E,
their only time lock to use watch movements with an integral crystal cover,
also had intricately engraved and gilt earlier American Waltham movements from 1887.
Waltham survives to this day as Waltham Aircraft Clock Corporation producing
high quality, mechanical aircraft clock instrumentation. Consumer watch
making stopped in 1957 and clocks in 1994.
The similarity of Banker's movement was probably not
coincidental since Banker's disappeared as a brand in 1915 and Mosler Safe
Co. appeared in 1916 based on designs very similar to that of Bankers. Case
#11478, 5"h x 4"w x 2 7/8"d, file 42
Manufactured in the 1950's. By this time Mosler had switched
to the less expensive Recta brand of watch movement made by
Muller and Vaucher, Switzerland and continued with this until 1967 when
Mosler ceased making time locks. They
still had the same movement-body configuration but glass watch crystal over
the movements was now a plastic press-fit piece and without the brass bezel.
Around this time most US time lock makers had turned
to Swiss imports. Lock is also equipped with a manual unlock lever. Case #22126,
5"h x 4"w x 2 7/8"d. file 210
The first two photos below show a Diebold safe door from the 1880's
with a later retro-fitted Mosler 2 movement time lock made in the 1920's; similar to 'A'.
You can see an identical Diebold safe door fitted with its original
time lock, a three movement Sargent and Greenleaf. At the time the safe was made,
Diebold was strictly a safe and vault manufacturer and did not make their own time locks.
Next a really tiny safe with the same style of 2 movement Mosler, since the
time lock case is 5" tall the inside of the door can't be much more than 17"
or so tall.
The third set shows a Mosler vault door with a Mosler 3 movement
time lock dating from the 1940's.