2010 Marathon Diver's Automatic GSAR 41mm 6645-21-558-0133

Here is a 2010 Marathon Diver's Automatic GSAR 41mm (Ref. 6645-21-558-0133), a legendary military-issue tool watch built to strict government specifications for search-and-rescue operations. This Government Search and Rescue (GSAR) reference represents the quintessential epitome of purpose-built tactical horology. The highly robust 41mm 316L stainless steel case introduces a chunky, uncompromising architecture built like a miniature vault. With a versatile case thickness of 13.5mm and a compact lug-to-lug length of 48mm, its clever ergonomics deliver an incredibly balanced, secure, and authoritative wrist presence. The entirely brushed case features deep, oversized bezel serrations designed for effortless grip with tactical gloves, while a heavy-duty signed screw-down crown ensures a professional-grade 300-metre (1000ft / 30 ATM) water resistance rating. A scratch-resistant sapphire crystal sits flush over a deeply brooding, matte black military dial. Designed for instantaneous readability under high-stress operational conditions, the layout features a classic 12/24-hour military scale with a clean date window neatly positioned between 4 and 5 o'clock. The defining hallmark of the GSAR is its self-contained illumination system, which utilises specialised Tritium gas tubes on the hands and hour markers, along with a MaraGlo luminescent triangle at the 12 o'clock bezel position. These micro-gas tubes emit a continuous, reliable glow for decades without requiring any external light source to charge. On the reverse, the solid steel case back is deeply stamped with official military metadata and NATO Stock Numbers (NSN). Inside lies the premium, Swiss-made Sellita Cal. SW200 automatic movement, a highly regarded industry workhorse operating at a high-beat frequency of 28,800 vibrations per hour (4Hz). Utilising 26 jewels, this self-winding calibre delivers robust daily durability, hacking seconds, and quickset date functionality. It comes paired with a 20mm rubber strap and a signed buckle. The watch comes complete with its presentation box and booklet.

This watch is sold with its Marathon box and Marathon booklet. It comes paired with a 20mm rubber strap and a signed buckle. The watch is from February 2010 and is sold in worn and enjoyed condition, as seen in the photos. Small blemishes can be seen in certain lights on the crystal. It comes with our 12-Months Warranty.

If you require a proper tool watch that’s robust, purpose-built and designed to simply get on with the job, it’s hard to beat the Marathon GSAR. Everything here feels designed with function first, from the chunky case and incredibly grippy bezel to the always-visible Tritium tubes and 300 metres of water resistance. Add in the Swiss automatic movement and genuine military credentials, and you’ve got a watch that really is built to be used. No unnecessary frills or gimmicks, just a seriously capable mechanical watch that feels like it could take almost anything you throw at it. Add this tank of a watch to your collection today!

Reference : 6645-21-558-0133
Movement : Automatic Sellita Cal. SW200
Age : February 2010
Year : 2010
Case Size : 41mm
Case Thickness : 13.5mm
Lug to Lug : 48mm
Lugs : 20mm
Condition : Pre-Owned
Box and Papers : Box & Booklet
Case Material : Stainless Steel
Warranty : 12-Months Warranty
The wrist model's wrist size is 7inch

Marathon's roots can be linked to the establishment of Weinstrum Watch in 1904, which later became known as Wein Brothers. This company paved the way for the future development of timekeeping instruments that would meet the needs of both civilians and military personnel. In 1939, Morris Wein took a significant step by founding Marathon Watch. He was driven by a commitment to creating outstanding timepieces that would resonate throughout North America. From 1941 onwards, Marathon Watch played a vital role in supporting the Allied Forces during World War II by producing specialised timing instruments. These watches were meticulously designed to meet rigorous military specifications, showcasing a perfect combination of Swiss precision engineering and robust construction needed for critical environments. Designed in Canada, where the company's headquarters is located, Marathon watches are manufactured in La Chaux-de-Fonds, Switzerland, renowned for its long-standing watch-making tradition. As a result of this meticulous craftsmanship, Marathon watches proudly carry the "Swiss Made" designation on their dials. Today, Marathon remains a family-owned business, with the fourth generation of the Wein family at the helm.