NR-01 SILICA
A 5-gram titanium flying tourbillon by Le Cercle des Horlogers, inside a two-piece quartz composite case machined by Composite Busch — seamless across the face and flanks. Sixteen grams on the wrist. No screws in sight, and the case lightened wherever the engineering allowed.
Most watches are assembled from many parts. NR-01 SILICA's upper case is grown from a single block. The top bezel and the case middle are not two parts joined together — they're one seamless piece of watch-grade quartz composite, machined until every seam, every screw hole, every visible compromise disappears from the face and flanks. A separate caseback frame closes it from below, secured entirely by hidden titanium hardware — two pieces total, with nothing visible where they meet.
What's left holds a 5-gram titanium flying tourbillon, inside a case that weighs 14.05 grams — 16.05 with a featherweight 2-gram Dyneema strap on your wrist. This is a limited edition of 50 pieces. It exists to prove what the atelier can build, and to open the door to what comes next.
Sixteen grams on the wrist.
Nothing more than necessary.
Both crystal weights check out against real sapphire density (3.98 g/cm³): 1.95g front, 0.90g rear — the rear window sits inset within the caseback frame, smaller than the edge-to-edge front crystal, while still giving a full, unobstructed view of the tourbillon.
Five decisions that
define the object.
Two-piece case, seamless top
The top bezel and case middle are machined as one continuous block. No lateral "ears," no seams on the face or flanks — deeply recessed at 3 and 9 o'clock. A separate caseback frame closes it from below.
Quartz composite case machined by Composite Busch — the sole case manufacturer across the entire NR series, every model, every edition.
Hidden fixation
Every screw lives inside the case. Titanium capsules are bonded into blind wells and locked from the caseback, so the face and flanks stay untouched.
Le Cercle des Horlogers tourbillon — 5g titanium
A custom flying tourbillon caliber, cut entirely from Grade 5 titanium at 5 grams, visible from both sides through flat sapphire.
Al-Li clamping rehaut
A skeletonized Aluminium-Lithium rehaut with four floating triangular islands and mirror-polished black anglage locks the movement in place — carrying twelve suspended, mirror-polished index sleeves.
Super-LumiNova, embedded
The glow isn't painted on — it's poured directly into the case body and into the base of each hour well, so the light reads as part of the material, not an applied layer.
One neutral body.
Three accent details. Six editions.
Editions 01–05 share a neutral grey quartz composite body — Ocean Drive breaks from it entirely. Every edition speaks through three details: the glow inside the case, the crown, and the lume at the base of the hour wells.
Every case shown below — across every edition and every capsule — is machined by Composite Busch, the sole case manufacturer for the entire NR series.
NR-02
CARBON LIGHT
The record attempt. Built to be the lightest tourbillon ever put on a wrist.
Where NR-01 SILICA proved the seams could disappear, NR-02 CARBON LIGHT removes what's left — one continuous carbon canister, no spring bars, no screws anywhere on the piece.
NR-01 SILICA: an edition of fifty.
Considered one client at a time.
NR-01 SILICA was built as a proof of concept — for what one atelier, working without compromise, can put on a wrist. Each of the 50 NR-01 SILICA pieces, and every NR-02 CARBON LIGHT limited to 10, is discussed individually, by appointment.