Quick answer The Marathon GSAR and MSAR have the same spec: Sellita SW200-1 automatic, 300m water resistance, tritium tubes and a sapphire crystal. The difference is size and price. The GSAR is 41mm with a 48mm lug to lug at $2,000. The MSAR is 36mm with a 43.5mm lug to lug at $1,400. Pick by wrist, not by features.
If you've decided on a Marathon search and rescue diver, the next question is which size. The GSAR and MSAR look nearly identical in photos, and Marathon builds them to the same specification. Here's what actually changes between them and how to tell which one will fit you.
| Feature | GSAR | MSAR |
| Best for | Average to larger wrists, more wrist presence | Smaller wrists, wearing under a cuff or wetsuit sleeve |
| Case size | 41mm, 14mm thick | 36mm, 13mm thick |
| Lug to lug | 48mm | 43.5mm |
| Lug width | 20mm | 18mm |
| Movement | Sellita SW200-1 automatic | Sellita SW200-1 automatic |
| Water resistance | 300m (30 ATM) | 300m (30 ATM) |
| Lume | Tritium tubes + MaraGlo | Tritium tubes + MaraGlo |
| Price point | $2,000 | $1,400 |
What's the Difference Between the Marathon GSAR and MSAR?
Size and price. Marathon calls the GSAR its Large Diver's Automatic and the MSAR its Medium Diver's Automatic. Both come from the same SAR (search and rescue) series, developed to Canadian Government requirements and in service with Canadian and US units since the early 1990s.
The MSAR is 5mm smaller across, 1mm thinner and 4.5mm shorter lug to lug. Everything that matters for function carries over unchanged.
Is the MSAR Just a Smaller GSAR?
Yes. Both use the Sellita SW200-1 automatic with Incabloc shock protection, a unidirectional 60-minute bezel, a sapphire crystal, a screw-down crown and 300m of water resistance. Both have tritium gas tubes on the hour markers and hands, so they glow all night without charging.
The MSAR is also an active line item in the US government procurement catalog, with National Stock Number 6645-01-697-4204. That's a procurement record, not a heritage claim.
Which One Fits Your Wrist?
Lug to lug matters more than diameter. Measure across the flat top of your wrist. If 48mm reaches past the edges, the lugs will hang over and the GSAR will look and feel too big. That's when the MSAR's 43.5mm makes sense.
- GSAR: in our GSAR review it wore smaller than the specs suggest, because much of the 14mm height is the bezel. On a 7-inch-ish wrist it balances well.
- MSAR: the MSAR sits closer to a 36mm dress watch in size and slides under a shirt cuff or wetsuit sleeve more easily.
- Straps: the GSAR takes 20mm straps and the MSAR takes 18mm. Both sizes are easy to find.
Is the GSAR Worth the Extra Money?
You aren't paying extra for capability. The movement, lume, water resistance and crystal are the same. The $600 gap buys a bigger watch with more presence and a bigger, grippier bezel. If both sizes fit you, choose the one you like looking at. If only one fits, the decision is already made.
Our Take
These are the same tool in two sizes, and that's rare. Most brands shrink a dive watch by cutting features. Marathon didn't. If the 48mm lug to lug fits your wrist, the GSAR has more presence and that bezel is great with gloves. If it doesn't, the MSAR gives up nothing that matters and costs less.
One thing neither one fixes: the finishing is plain. These are utilitarian cases with no polished details, so if you want refinement up close, neither size will change your mind.
Who This Is For
- GSAR: average to larger wrists, or anyone who wants a dive watch with real wrist presence.
- MSAR: smaller wrists, people who wear their watch under a cuff, and anyone who finds most dive watches too big.
- Skip both if you want fine finishing for the money. Look at something more polished instead.
Quick Checklist
- Measure the flat top of your wrist and compare it to 48mm (GSAR) and 43.5mm (MSAR).
- Decide on a dial: both come in black or Arctic white.
- Check strap width: 20mm for the GSAR, 18mm for the MSAR.
- Buy from an authorized dealer so you get the full Marathon warranty.
Frequently Asked Questions
Do the Marathon GSAR and MSAR have the same movement?
Yes. Both use the Sellita SW200-1 automatic with Incabloc shock protection. The movement, water resistance, tritium lume and sapphire crystal are the same in both sizes.
What does MSAR stand for?
MSAR is the medium-size version of Marathon's SAR (search and rescue) dive watch. Marathon lists it as the Medium Diver's Automatic, while the 41mm GSAR is the Large Diver's Automatic.
Is the MSAR good for a small wrist?
It's one of the few serious dive watches built for one. The 36mm case and 43.5mm lug to lug fit wrists where the 48mm GSAR would overhang.
Is the GSAR worth $600 more than the MSAR?
Only if you want the bigger size. The extra money buys a larger case and more wrist presence, not better specs.
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