This is a beautiful, functional piece of military history, used by the US forces during WW2. The case of this example is made of silver.
 
The pocket watch will often be seen in a case or a box that was intended to isolate it and protect it from shocks or accidental damage. Sadly this does not have the accompanying box, but they are very rare and make the pieces significantly more expensive in accordance with this.
 
The dial is 24 hours meaning it takes a full day for the hour hand to rotate. The minute hand still progresses around the dial as per usual. The watch also has a hacking feature, meaning the second hand stops when you pull the crown out. This ensures very precise time setting. The large, central second hand is a clear indicator of the importance of precise timekeeping in the display of the time. 
 
This particular example has no signing to the case back and is a bit of a mystery in that respect. It may have been left over stock, but one can only speculate. It has clearly been used in its life. It was purchased in Helston which has the RNAS Culdrose base and attracts international military.
 
The movement was based on the 21 jewel, 16 size 992B movement. However, an extra jewel was added to support the second hand pinion, meaning the movement had 22 jewels and was called the 4992B. The movement is keeping time to within -15 seconds a day. 
 
Please see the images as these compliment and aid the description provided below.
 
Dial: 
The dial is original and has a black matte finish designed for contrast against the white writing. It is in very good condition with no major scratching and an even tone overall. 
The dial is signed G.C.T to the centre, with a 24 hour inner hour track. The outer track is for the minutes and seconds which function normally.
 
Hands: 
The hands are original and are white in tone for visibility in the dark. They are in good condition with limited corrosion and no bending.
 
Glass: 
The crystal may be original. It has surface scratching consistent with age.
 
Crown and loop:
The crown is original and is in good condition, with some minor wear from use.
The loop is beautifully stylised and is original. It is in good condition with light surface scratching. 
 
Bezel:
The bezel is silver and has a good coin edge finish and screws in place properly as it should, the thread is good. There are light scratches. Overall, it is in good condition.
 
Case:
The case is 800 Silver and is in average condition. There is light surface scratching consistent with age. There are some small dents to the central section of the case. The case has tarnishing to the silver consistent with ageing. 
 
Caseback:
The case back is in average condition for its age. It has surface scratching and tarnishing to the silver. This can be cleaned but has been left as it is authentic ageing. It has a coin edge which is in good condition. It screws in place properly as it should, the thread is good.
The inside of the caseback is signed “Keystone”, “Silver 800 Fine” with the serial number 4680264. It is in good condition with service etchings. 
 
Movement:
The movement was based on the 21 jewel, 16 size 992B movement. However, an extra jewel was added to support the second hand pinion, meaning the movement had 22 jewels and was called the 4992B. It has the serial number 4014394. It is marked U.S. Govt, adjusted to temperature and 6 positions.
The movement is in good condition for its age cosmetically. The service history is unknown and the pocket watch hasn’t been serviced by ourselves.
It has a daily gain of -15 seconds a day, with an amplitude of 235 and a beat error of 4.3m/s.
 
Case dimensions: 
Case width: 51.5mm 
Case length: 51.5mm 
Case length with loop: 64mm 
Case length with crown: 57mm 
Case Depth: 18mm