The AP × Swatch Royal Pop comes in two case configurations: Lépine (standard) and Savonnette (hinged cover). They're not interchangeable, and your strap choice depends entirely on which one you own. This guide explains the difference — and why it matters more than you might think.
A brief history of the configurations
Both terms come from 19th-century French pocket watch terminology, names that have survived into modern horological language despite their original applications being largely obsolete.
Lépine
Named after Jean-Antoine Lépine, the French watchmaker who revolutionized pocket watch design in the 1770s. The Lépine configuration is the "open-face" pocket watch — no cover over the dial, the crown traditionally positioned at 3 o'clock. Most modern wristwatches inherit this layout.
For the Royal Pop, Lépine means standard watch case: 40mm bioceramic body, integrated bezel, dial visible at all times. Six of the eight Royal Pop colorways are Lépine.
Savonnette
Named after the French word for "soap" — a reference to the smooth, rounded shape of the soap-style pocket watches with hinged covers. The Savonnette configuration features a hinged metal cover (the cuvette or front cover) that protects the dial when closed and opens via a small pusher at 3 o'clock.
Historically, Savonnette was the formal evening configuration — you'd press the pusher, the cover would spring open, and you'd glance at the time discreetly. The configuration is virtually extinct in modern wristwatches.
Why Audemars Piguet brought it back
AP × Swatch's choice to include Savonnette in the Royal Pop lineup is deliberately countercultural. In an era of always-visible smartphone clocks and quartz watches, the Savonnette is an explicit ritual: the act of opening the cover to consult the time. It's the same energy as winding a mechanical watch despite having quartz — a celebration of the unnecessary.
Only 2 colorways are Savonnette in the Royal Pop lineup, and these are limited editions:
- Lan Ba (Baby Blue)
- OTG Roz (Teal with rose accents)
The technical difference
| Property | Lépine | Savonnette |
|---|---|---|
| Case diameter | 40mm | 40mm |
| Cover | None | Hinged at 9 o'clock |
| Dial visibility | Always visible | Requires opening cover |
| Crown position | 3 o'clock | 3 o'clock + pusher for cover |
| Hinge mechanism | None | Side of case at 9h |
| Number of colorways | 6 | 2 (limited editions) |
| Retail price (AP × Swatch) | Standard | Higher (limited) |
Why the configuration affects the strap
Critical: the Savonnette has a hinged cover. The hinge is located on the side of the case at the 9 o'clock position. The cover opens via a small spring mechanism activated by pressing a pusher at 3 o'clock.
A strap that doesn't account for this hinge will:
- Block the cover from opening fully (defeating the entire Savonnette concept)
- Or worse, apply pressure on the hinge and damage the mechanism over time
This is why most generic 20mm aftermarket straps don't work on Savonnette Royal Pop watches. They're designed assuming standard watch cases with no special clearance requirements.
The Savonnette-specific design
A strap designed for Savonnette must include:
- Cover clearance: the strap and case interface must not obstruct the hinge arc or block the cover opening
- Pusher accessibility: the cover pusher at 3 o'clock must remain easily accessible
- Functional preservation: opening the cover on your wrist must feel natural, not constrained
The visual effect of a well-designed Savonnette strap: you can press the pusher, the cover springs open, and you see the dial — all while the watch sits naturally on your wrist. The strap participates in the ritual rather than fighting it.
Why this matters: it's not just function
Some buyers ask: "Can't I just keep the cover closed and use any strap?" Technically yes, but it defeats the entire reason to buy a Savonnette Royal Pop. The hinged cover is the defining feature of the configuration. If you keep it closed, you've effectively turned a Savonnette into a slightly thicker Lépine.
The buyers who chose the Savonnette colorways (Lan Ba and OTG Roz) did so specifically for the cover ritual. They want to open it. They want to show it. A strap that prevents this is the wrong strap.
How to know which one you have
Look at the side of your watch case at the 9 o'clock position:
- If you see a smooth, uninterrupted case profile: you have a Lépine.
- If you see a small hinge mechanism (a slight protrusion with a pivot): you have a Savonnette.
Alternatively, check your purchase receipt or the original packaging — the reference number on Swatch's labeling explicitly indicates the configuration.
Atelier Léman's two strap families
We produce two distinct strap families to address both configurations:
Lépine family (6 colorways)
Standard polymer cage system. Color-matched FKM Viton rubber. 20mm lug width, 130-200mm wrist range. CHF 149 pre-order, delivery end of July 2026.
- Otto Rosso (Cherry Red)
- Huit Blanc (Cream)
- Green Eight (Forest Green)
- Blaue Acht (Pale Teal)
- Orenji Hachi (Navy with orange details)
- Ocho Negro (Jet Black)
Savonnette family (2 colorways, limited)
Specialized polymer cage with hinge-clearance geometry. Color-matched FKM Viton rubber. Preserves cover opening. CHF 179 pre-order, delivery end of July 2026.
- Lan Ba (Baby Blue)
- OTG Roz (Teal with rose accents)
Cross-compatibility
For clarity: Lépine straps do not fit Savonnette watches, and Savonnette straps do not fit Lépine watches. The cage geometry is configuration-specific.
If you own multiple Royal Pop watches in different configurations, you'll need configuration-appropriate straps for each. The pre-order on our website associates each strap colorway with its specific configuration to prevent confusion.
The decision
You don't really choose between Lépine and Savonnette — you have what you have. Your strap choice should follow the watch you own.
If you're considering buying a Royal Pop and haven't decided yet: the Savonnette offers a more distinctive horological experience (the hinged cover ritual is genuinely uncommon in 2026), but it's also more expensive and only available in 2 colorways. The Lépine offers more color variety, lower price, and is the entry point most buyers will take.
Either way: the strap matters. Color-matched, geometrically correct, and configuration-appropriate.