LUMINOX 3900 Luminox Navy SEALs This is a LUMINOX Navy SEALs model 3900, purchased in the United States about 20 years ago. I have been regularly replacing the battery, so it is working normally. Since it is quite old, there is deterioration of the tritium gas, deterioration of the rubber that fixes the spring bar of the Velcro band, some stickiness, and scratches on the back cover. The crystal is almost scratch-free and beautiful. As the Velcro band belt has deteriorated, I will include a ZULUDIVER NATO strap as a bonus. The metal fittings on this one are matte black, which is very cool. Since it is quite old, please purchase only if you understand that it is a used item. Also, although it is currently working, the battery may run out during shipping, so please understand that. No claims and no returns, please.