Thanks for sharing.
From page 334 of British Military Timepieces by Konrad Knirim:
1. Brand name of J. Bernheim & Co, La Chaud de Fonds, Switzerland
2. Probably the most common ATP (16 brands in total)
3. Two variants: scalloped or slotted caseback
4. Timor 99B movement based on Peseux 190 caliber
5. Serial numbers start with P or 2, 7, 13, 14
6. ATP = Army Trade Pattern
7. Only ATP with Waterproof on the dial.
Some more info and about straps: http://af0210strap.com/index.php/the...-f-0210-strap/
I have just the one ATP, an Enicar, inherited through family links. Nice watch although needs a service as runs 10 minutes fast per day. Mine is on a vintage battered canvas strap, a precursor to the NATO strap and worth more than the watch.