A Marathon military watch is built for hard use, but even the toughest tools need routine care to perform reliably for decades. Rinsing after field exposure takes two minutes and prevents salt and grit from corroding metal components and working into crown seals. The screw-down crown gasket wears over time, and fogging inside the crystal is the signal that replacement can’t wait. The tritium tubes that give Marathon watches their constant glow are glass — direct impact cracks them, accelerating the dimming that can’t be reversed in the field. Pressure and shock ratings reflect tested thresholds, not permanent guarantees, and accuracy changes after hard impacts warrant prompt inspection. Automatic movements need regular winding or a watch winder during storage to keep lubricants distributed. Magnetic fields and temperature extremes both affect movement performance over time. And every three to five years, a full professional service by a watchmaker with Marathon-specific experience keeps the movement clean, sealed, and accurately regulated.
source: https://www.timesticking.com/7-tips-for-maintaining-your-marathon-military-watch/
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