This is a very good example of a Military issue Pocket Watch  

The black Face that has fluorescent material Arabic Numerals and Hands with fluorescent material inserts, unusually there is no degrading of the Face Surface or the Numerals or the luminescent inserts to the Hands

The quality Lever Movement, winds well, runs strongly and keeps time

The Pocket Watch Case is in very good condition, B61770 and the War Office Broad Arrow is engraved on the Back. 

it measures 2.0 inches diameter excluding the Crown and Loop.