Thank you for viewing. This was purchased approximately one year ago from the official marathon website overseas. The serial number is three digits. The strap is an upgraded genuine one. I have worn it a few times, but due to the rise in new prices and the excellent condition, I am listing it at a premium price. ■ Drive System Quartz ■ Movement No Date: ETA F06.402 High Torque Movement ■ Dial Analog dial with two time scales (12-hour, 24-hour) ■ Case Material 316L Stainless Steel Case ■ Windshield Material Sapphire Crystal ※ Harder than regular glass windshields, making it scratch-resistant. ■ Water Resistance 100M (10 atm) ※ Not suitable for diving, but can be used for swimming on the surface. ■ Illumination Tritium Vial Illumination ■ Size 41mm x 48mm x 11mm ■ Weight 66g ■ Lug Width 20mm ■ Strap MIL-S-46383B, Type II Spec Nylon Strap ■ Other Features Screw-down Crown Screw-back Rotating Bezel (60 clicks) ■ Accessories Instruction Manual (English) Serial Number Card - Brand: MARATHON - Color: Black - Material: Stainless Steel (Case) - Strap Material: Nylon - Dial Type: Analog - Back Engraving: Waterproof Specification - Accessories: Box, Instruction Manual, Bubble Wrap Marathon Navigator Steel Pilot No Date