Most white-dial watches are chosen for daytime style and quietly fail after sunset. The Marathon MSAR Auto WW194026SS-0508 does both jobs. Its Arctic white dial gives bold daylight contrast, and its tritium gas tubes glow continuously at night, making this 36mm Swiss automatic dive watch a true around-the-clock instrument.

That dual nature is the appeal for collectors who already own a black-dial diver. A white SAR offers a completely different mood on the wrist, brighter and a little more vintage-feeling, while delivering the same no-compromise toolkit: sapphire crystal, 300 meters of water resistance, a screw-down crown with protective guards, and an oversized 60-minute bezel with a MaraGlo pip. The tritium tubes on the markers and hands are self-powered and rated to remain useful for up to about 20 years, so the night readout never depends on how much sun the watch saw that day.

This listing features a Standard-Issue dial with no government markings, a date window at 4:30, and a stainless steel bracelet. The Sellita SW200-1 automatic movement inside uses Incabloc shock absorbers, and at 36mm with 18mm lugs, the case suits smaller wrists or anyone who prefers a classic, compact diver.

Marathon MSAR Auto WW194026SS-0508 Spec Sheet

• Size: 36mm, approximately 14mm thick
• Case: 316L stainless steel, brushed
• Lugs: 18mm
• Movement: Sellita SW200-1 Swiss automatic, 26 jewels, about 41-hour reserve
• Water resistance: 30 ATM (300m)
• Crystal: sapphire
• Lume: tritium tubes on markers and hands, MaraGlo pip
• Dial and bracelet: Arctic white NGM dial, stainless steel bracelet

Day dial and night dial, in one compact case.