When does a mechanical watch need a service?
Typical service intervals, the warning signs that a watch needs attention sooner, and what a full service involves.
Typical intervals
Most brands now suggest a full service every 5 to 10 years. Older watches and vintage pieces benefit from shorter intervals, because their oils were less durable and parts are harder to replace if they wear.
Signs it needs one sooner
- Accuracy has drifted badly and demagnetising did not help.
- Power reserve has dropped noticeably.
- Winding feels gritty or the crown feels loose.
- Moisture or fog under the crystal. Get this seen to immediately.
- The date or calendar changes at the wrong time or skips.
What a full service involves
The watchmaker takes the movement apart, cleans every part, replaces worn ones, oils it, reassembles and regulates it, then replaces the gaskets and tests water resistance. Expect it to take a few weeks.