Luminox Watch MIL-SPEC XL.3351.1.SET. Mil-Spec (short for Military Specification) refers to the military standard from the U.S. Department of Defense. When a product is compliant with these standards of sourcing, fabrication, material, quality and supply, it could be referred to as a Mil-Spec product or component. The Luminox 3350 Series watch is developed and built in compliance with the technical requirements of MIL-SPEC - MIL-PRF-46374G TYPE III CLASS 1.