This is A MARATHON US MILITARY ISSUED AUTOMATIC DIVE watch is in VERY GOOD condition! The US MIL-SPEC number is 6645-21-558-0133.
Automatic ETA Cal. 2824-A2.  All nice working order. Came with used original marathon rubber band.

• REF.NO:  GS-14F-0027K
• YEAR: CIRCA 2005
• MODEL:   GSAR (Search & Rescue Diver’s)
• MOVEMENT: ETA Cal. 2824-A2
• CASE DIAMETER: 41MM 
• ACCESSORIES: NO. WATCH ONLY