Poseidon is equipment supplier to the German Kampfschwimmer ( combat diver ) and Naval Commandos.

Poseidon Diver P10031 Professional 500m black

Details:
Case: stainless steel, crown protector
Crystal: mineral, extra strong
Bezel: stainless steel, luminous point in the triangel
Clockwork: Seiko - Quartz
Pointer: 3-way (h/min/sec)
Waterresistance: 500 m / 1650 feet
Strap: neopren (steel buckle), 20mm
Crone: screwed, left at 9 o'clock 
Bottom: screwed
Dial: black
Size: 36mm / high 11mm
Warranty: 2 years