Alpina 592 WWII German Luftwaffe Gents Manual Wind Pilots Watch

In lovely working order.
Alpina 592 15 or 17 jewel manual wind mechanical movement. I'm not sure but think the movement is a 15 Jewel type, but could be a 17 jewel type.
The watch is in a very nice clean condition, and working well.
The watch keeps time very well.
The watch crystal is nice and clear.
The chrome plating has largely worn away over the years.
The watch face has some patina due to its age. The watch is in an unrestored original condition.
The case back has had its D number filed off. This looks to have been done many years ago. I'm told this was done to disassociate the watch with its original use and origin.
The strap has some ware to the gold plating surface, but apart from that it is in good condition. The strap measures around 17cm to 24cm long (including the watch case).
Feel free to ask any questions.
Many Thanks for looking.