Duplex Electric Co., New York
The interior view of the timer. The case is nearly identical to a two movement
Mosler time lock, except for the door latch which is identical that of the
Banker's Dustproof Time Lock Co. Mosler bought out Banker's in 1915 and their
cases and movements were identical. In fact this could even be a Banker's
Dustproof case but this author has no example of a two movement by that company
to make a comparison. Mosler's changes were to substitute a small handcuff-style
key lock for the spring push latch, seen here. and to have the words "Pat. Nov.
21, 1916 Dec. 5, 1916" stamped on the inside of the door near the door lock and
incorporated winding holes in the door with a sliding dust latch.
Rear view showing the openings where the wires enter the case.
The first photo shows a Mosler time lock in a case nearly identical to the
Duplex Electric case. The next
photo shows the first type of watch movement used by Mosler, an 18 size Model #4
supplied by the Illinois Watch Co., Springfield, Illinois and is illustrated
above. These were used until 1933 when the Hamilton watch Company took over
Illinois Watch Co. This is the same as used for the Duplex Electric timer.
Bank alarm timer by the Duplex Electric Co, c. 1920. The Duplex company
contracted with Mosler for their alarm timers and was associated with the
company for many of their other products. 4"w x 5"h x 2 3/4"d. Case #03003.