WW2 Pierce Official Ordnance Mono Pusher Wrist Stopwatch/ Chronograph 
 
This Watch was most probably used by Bomb Aimers in the RAF, or Artillery Officers  this watch is calibrated to 1/5th of a second. It features the letters T.P. ( Trade Pattern ) and the Broad Arrow ( Pheon) designations for official ordnance.
The watch has an all steel case which is in very good condition, there dial also in excellent condition. 
 
Featuring a Pierce cal 134 movement, one press of the pusher starts it a second press stops it and a third resets it. 
 
Cosmetically overall this is in very good condition and running well,