Start with the exact movement
A SARB, Alpinist-era model or older Prospex may be worth servicing even when a cheaper movement swap would be possible on a lower-value watch.
What changes with age
Lubricant condition, wear, previous service quality, moisture history and parts availability become more important as the watch ages.
Common 6R15 complaints
Rate instability, poor reserve, stopped movement, winding issues and watches that are simply overdue for service.
How we approach the repair
We look at the whole watch, not just the caliber. Originality, condition and what you want from the watch determine whether we recommend service, a targeted repair or another option.