Swiss; M.J. Tobias; Mans; C. 1820s
CASE: The 18K yellow gold, 52mm, open face case features floral and machined
DIAL: This white porcelain dial displays Roman numerals and has spade hands.
MOVT: This 1-jewel, key-set movement with cylinder escapement is gilt with a
bridge style layout.
C 3 (The case is in very good condition)
D 3-43 (The dial is in very good condition, hairline )
M 3 (The movement is in very good condition)
The very first pocket watches up until the third quarter of the 19th century had
key-wind and key-set movements. A watch key was necessary to wind the watch and
to set the time. This was usually done by opening the case back and putting the
key over the winding-arbor (which was set over the watch's winding-wheel, to
wind the mainspring) or by putting the key onto the setting-arbor, which was
connected with the minute-wheel and turned the hands.
This watch includes a reproduction of the correct size key, it is not the
The horizontal or cylinder escapement replaced the verge escapement was much
thinner than the verge, allowing watches to be made thinner.
Clockmakers found it suffered from excessive wear, so it was not much used
during the 18th century, except in a few high-end watches with the cylinders
made from ruby.
The French solved this problem by making the cylinder and escape wheel of
hardened steel and the escapement was used in large numbers in inexpensive
French and Swiss pocketwatches and small clocks from the mid-19th to the 20th
Instead of pallets, the escapement uses a cutaway cylinder on the balance wheel
shaft, which the escape teeth enter one by one.
Each wedge-shaped tooth impulses the balance wheel by pressure on the cylinder
edge as it enters, is held inside the cylinder as it turns, and impulses the
wheel again as it leaves out the other side.
The wheel usually had 15 teeth, and impulsed the balance over an angle of 20° to
40° in each direction.It is a frictional rest escapement, with the teeth in
contact with the cylinder over the whole balance wheel cycle.