A guest steps off the tender, peels a wet watch off his wrist and drops it into your palm without a word. It is warm, heavier than it looks, and it is worth more than the car you drive. Before you do anything at all with it, you need to know what you are holding — because almost every expensive mistake in this course begins with a crew member who guessed.
Three kinds of movement
- Mechanical (hand-wound) — a mainspring wound by hand. It stops after a day or two if nobody winds it. Winding it is not your job.
- Automatic (self-winding) — wound by the motion of the wearer's wrist. Left on a nightstand it simply stops. A stopped watch is not a broken watch.
- Quartz — battery powered, runs for years in a drawer. When it dies it needs a battery, not a rescue attempt.
Complications are anything the watch does beyond telling the time: date, day-date, moonphase, chronograph, annual or perpetual calendar, minute repeater. They matter to you for exactly one reason — they are the parts that break when the wrong person presses a button at the wrong moment.
Straps, cases and their weaknesses
| Material | Hazard | Handling rule |
|---|---|---|
| Leather strap | Salt water, sweat, sunscreen; rots, stains, stiffens | Never rinse or soak; blot dry, report if it has been in the sea |
| Steel / titanium bracelet | Salt crust; scratches from contact with other pieces | Store alone in its pouch, never in a pile |
| Gold or platinum case | Soft metal, scratches easily; chlorine attacks gold alloys | Keep away from pool and cleaning chemicals |
| Rubber / silicone strap | The most tolerant, but stains from oils and creams | Wipe with a dry soft cloth only |
| Sapphire crystal | Very hard, but chips and shatters on impact | Never stack anything on top of a watch |
What "water resistant" really means
The depth marking on a caseback is a static pressure rating measured on a new watch in a laboratory. It is not a swimming licence. 30m (3 ATM) means splashes and rain — not a shower. 50m survives a rinse. 100m and above, usually with a screw-down crown, is what most makers consider swim-safe. A crown left unscrewed will flood even a serious dive watch. Age, a perished gasket, a knock against a deck fitting — all of these quietly reduce the rating, and none of them are visible from the outside.
Treat every marking as a claim about a watch that was new, dry and untouched. The watch in your hand is none of those things.
Your limits
You identify it, protect it, note it and pass it up the chain. You do not wind it, set it, open it, pressure-test it or clean it. If it has come out of the sea, it goes to the chief stew now, not at the end of your shift.
Onboard Notes
- A stopped automatic is normal. Do not shake it, wind it or "start" it.
- Water-resistance markings describe a laboratory, not the guest's afternoon.
- Leather straps and salt water are a permanent and expensive divorce.
- If you cannot name what you are holding, that is fine — just do not experiment on it.
- This is independent study. xplor is not an accredited training provider, and this course awards no certificate or qualification.