AtDTDA (2): 30 Railroad Watch

[robinlandseadel at comcast.net]

     "Sorry Boys," he frowned, making a show of pulling 
out and consulting his old fashioned railroad watch. 
"I'd love to stay and chat some more, but I've a little 
business to take care of." AtD pg 30

http://www.pockethorology.org/Railroad/Railroad.htm

Note, if you will, the name on this one, the very first 
to pop-up on the traverse web:

http://www.pockethorology.org/Railroad/Fig_1.jpg

Also;

http://barrygoldberg.net/railroad.htm

GENERAL RAILROAD TIMEPIECE STANDARDS

This led to the adoption in 1893 of stringent standards 
for pocket watches used in railroading. These railroad-grade 
pocket watches, as they became colloquially known, had to 
meet the General Railroad Timepiece Standards adopted in 
1893 by almost all railroads. These standards read, in part:
"...open faced, size 16 or 18, have a minimum of 17 jewels, 
adjusted to at least five positions, keep time accurately to 
within 30 seconds a week, adjusted to temps of 34 to 100 °F. 
have a double roller, steel escape wheel, lever set, regulator, 
winding stem at 12 o'clock, and have bold black Arabic 
numerals on a white dial, with black hands."
Additional requirements were adopted in later years in 
response to additional needs; for example, the adoption of 
the diesel-electric locomotive led to new standards from the 1
940s on specifying that timekeeping accuracy could not be 
affected by electromagnetic fields.


http://en.wikipedia.org/wiki/Pocket_watch

and scroll down.