· By Buffy
Escapements, Compared
An open scorecard: accuracy ceiling, robustness, self-starting, service tolerance, and cost across the escapement family.
Every escapement page on this site makes a case. This page makes the case against each one, in one table, scored 1–5 (5 = best). Scores are engineering judgments, not gospel — argue with them via the factors below.
| Design | Accuracy ceiling | Robustness | Self-start | Service tolerance | Cost to make | Where |
|---|---|---|---|---|---|---|
| Verge | 1 | 3 | 5 | 2 | 5 | tower clocks (historic) |
| Cylinder | 2 | 2 | 5 | 2 | 4 | cheap pocket watches (historic) |
| Duplex | 3 | 2 | 2 | 2 | 3 | slender pocket watches (historic) |
| Swiss lever | 4 | 5 | 5 | 4 | 5 | nearly all wristwatches |
| Co-axial | 4 | 5 | 5 | 3 | 3 | Omega and licensees |
| Detent | 5 | 1 | 1 | 2 | 2 | chronometers, regulators |
How to read the scores
- Accuracy ceiling — best achievable rate when perfectly made and adjusted, independent of case. The detent wins because the oscillator is freest (isochronism losses minimized).
- Robustness — tolerance to shocks, positional change, and neglect. The lever’s safety action and forgiveness dominate; the detent is fragile.
- Self-start — will it tick again after dying without special handling? Detents famously won’t.
- Service tolerance — how long between services before rate degrades, driven mostly by lubrication sensitivity. The co-axial’s whole pitch lives here.
- Cost to make — manufacturing and finishing burden at equal quality.
The verdicts people actually make
- You want a watch you can wear anywhere, service anywhere: Swiss lever. It is the QWERTY of horology — good enough everywhere, unbeatable on total cost of ownership.
- You want the longest stable interval between services: co-axial (with modern materials), accepting a smaller service network and fussier geometry.
- You want the last word in rate, in a box, on a ship: detent, plus a remontoir.
- You want history on your wrist: cylinder or duplex, and a patient watchmaker.
The deeper lesson from the whole table: escapements improve by removing friction from the oscillator’s life. Everything else — safety, starting, manufacturing — is the price paid for that removal.