Switzerland · Precision instrument making; Watchcase making; Jura heritage

Jura Watchcase Making — Boîtier Tradition

Boîtier de Montre — Horlogerie Jurassienne

The watchcase making (boîtage) tradition of the Jura Arc — the finishing and polishing of the precious metal cases that house Swiss watch movements. The boîtier reads the correct polish quality on the case flanks and lugs through a raking-light reflection assessment that is the third distinct application of the raking-light methodology in the Swiss watchmaking archive (after Geneva movement plates CRAFT-1282 and Geneva pavé setting CRAFT-1288), here applied to the curved three-dimensional surfaces of the watchcase exterior.

Risk level: Stable · Swiss watchmaking craft UNESCO ICH (2020)

Alternate Names
Boîtier; Boîtage; Polissage; Pentelographie; Cadre de boîte; Fond de boîte
Geographic Center
Delémont; Porrentruy — Canton Jura; the Jura Arc watchcase and watchcase polishing workshops
Community / Ethnic Group
Jurassien / Romand
Estimated Origin
19th century (Jura watchcase making developing as a specialist trade alongside the movement manufacturing tradition; the boîtage workshops concentrated in the Jura valleys)
Cultural Function
The watchcase is the visible, tactile face of a Swiss watch — the quality of the case polishing directly determines the consumer experience of a watch; the distinction between the mirror-polished case flanks (brillant) and the brushed case top (satiné) is one of the most refined quality distinctions in luxury goods manufacturing
Primary Materials
Gold (18ct yellow, rose, or white gold); stainless steel (316L or 904L); platinum; titanium (for sport watch cases)
Primary Tools
Progressive polishing laps; final rouge buffing wheel; directional raking light (for the 5-second surface assessment)
Process Overview
Case machined; progressive polishing stages; 5-second raking-light assessment after each stage; orange-peel detected = continue polishing; perfect mirror = proceed to next stage; brillant-satiné boundary checked for crispness; final inspection
Traditional Applications
Swiss watch movement housing (primary from the 19th century)
Contemporary Applications
Global Swiss watch market across all price tiers
Notable Practitioners
Jura Arc boîtiers; approximately 500–1,000 active Swiss boîtiers
Key References
Boîtier de Montre (Swiss watchcase industry; Swiss watchmaking school programmes)
Verification Status
Partially Verified

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