c.1939 Lemania ATP Official Ordnance Military Watch 
 
This is a slightly unusual watch as it has been fitted with a Sterile Dial.
 
Ministry of Defence only officially ordered 133,000 from various Swiss Manufacturers in 1939, known affectionately as Tommy Watches these predated the famous Dirty `Dozen by a number of years and were used in the heaviest fighting in WW2. 
After the war those that hadn't been lost or destroyed the `MOD tried to destroy, however not all were and that makes these watches very collectable now. 
This watch is actually in very good condition for its age and possible wartime experience showing minimal signs of wear.
The Army Trade Pattern Mark and Pheon (ATP) is clearly engraved on the back.
Inside the case there's  a 15 Jewel Tissot A27 Cal movement