Illinois 21-Jewel Super Clean Railroad
Pocket Watch “Bunn Special” with marked “Sixty Hour” Movement in White
U.S.; Illinois; Man’s; Serial# 5,132,219; C. 1928
CASE: The white gold-filled, 16-size, plain polished case has an open
face and is signed “Bunn Special Model – Wadsworth”.
DIAL: This white porcelain, double sunk, Montgomery style dial displays
Arabic hour numerals, Arabic minute track with red 5-minute numerals,
subsidiary seconds dial and has spade hands.
MOVT: This 21-jewel, lever-set movement with lever escapement is nickel
with a ¾ plate layout and is signed “Sixty Hour Bunn Special 21-Jewels”.
Marked “Sixty Hour Bunn Special Illinois Watch Co. Springfield, Adjusted
Temperature & Six Positions, Double Roller, Motor Barrel 21 Jewels,
C 3 (The case is in very good condition)
D 3-44 (The dial is in very good condition, two hairlines)
M 3-9 (The movement is in very good condition, slightly scratched)
About 1904 the Montgomery dials began to appear on some RR watches. The
distinguishing feature of the
Montgomery dial is that each minute is numbered around the hour chapter.
The five-minute divisions are in red, and
the true Montgomery dial has the number "6" inside the minute register.
These dials are favored by the railroad men.
Stem-wind, Lever-Set Movements
Mandatory for all railroad watches after roughly 1908, this kind of
pocket watch was set by opening the crystal and bezel and pulling out
the setting-lever (most hunter cases have levers accessible without
removing the crystal or bezel), which was generally found at either the
10 or 2 o'clock positions on open-faced watches, and at 5:00 on hunting
cased watches. Once the lever was pulled out, the crown could be turned
to set the time. The lever was then pushed back in and the crystal and
bezel were closed over the dial again. This method of time setting on
pocket watches was preferred by American and Canadian railroads, as
lever setting watches make accidental time changes impossible. After
1908, lever setting was generally required for new watches entering
service on American railroads.
An escapement is a device in mechanical watches and clocks that
transfers energy to the timekeeping element (the "impulse action") and
allows the number of its oscillations to be counted (the "locking
action"). The impulse action transfers energy to the clock's timekeeping
element (usually a pendulum or balance wheel) to replace the energy lost
to friction during its cycle and keep the timekeeper oscillating. The
escapement is driven by force from a coiled spring or a suspended
weight, transmitted through the timepiece's gear train. Each swing of
the pendulum or balance wheel releases a tooth of the escapement's
escape wheel gear, allowing the clock's gear train to advance or
"escape" by a fixed amount. This regular periodic advancement moves the
clock's hands forward at a steady rate. At the same time the tooth gives
the timekeeping element a push, before another tooth catches on the
escapement's pallet, returning the escapement to its "locked" state. The
sudden stopping of the escapement's tooth is what generates the
characteristic "ticking" sound heard in operating mechanical clocks and
Watch adjustment is the process of correcting those errors in the watch
that cause variation in time keeping. These include temperature
influences, variation in driving power and position of the watch with
respect to mechanism such as pendant up or dial up.
Watches with better calibre movements will have been adjusted at the
factory for a number of positions. The usual array of positions include
a subset of the following positions:
1. Dial up 2. Dial down 3. Bow up 4. Bow down (Not required by Railroad)
5. Bow left 6. Bow right
These positional adjustments are intended to
insure that the watch is just as reliable and accurate regardless of the
position in which it is stored or used.
In addition to positional adjustments, the watch
may also be adjusted for Temperature(heat/cold). Temperature affects
different elements in different ways. Heat will cause some metals to
expand faster than others, and cold may cause some metals to contract
more than others. A watch that is adjusted to temperatures will usually
include some combination of metals that allow the watch to maintain its
proper functionality within a larger range of temperatures than one that
is not adjusted for temperature.
The general rule of thumb with adjustments is that
more is better. However, for average every day use, a typical unadjusted
watch was perfectly adequate.