Materials and Features:

• Artisan "Concave-Inlay" Engineering: A masterclass in three-dimensional polymer architecture. This features dual yellow Rhodoid stripes precisely heat-fused into a saturated navy-blue base through a specialized "Lock-and-Key" studio process. The seamless surface transition is a definitive technical signature of the François Schoenlaub studio, indicating an elite-tier finish where the inlay junctions have achieved a near-molecular bond.

• 5mm Sculptural "U-Curve" Profile: Expertly carved from a substantial 5mm Rhodoid block, featuring a deep concave basin with thickened outer perimeters. This structural engineering creates a dramatic "shadow-box" effect that captures light within the concave basin, a hallmark of the studio's more architectural, sculptural periods.

• High-Contrast Nautical "Mod" Palette: A bold 1.25" circular silhouette utilizing a graphic, deeply saturated Navy and Canary Yellow palette. The precision of the parallel alignment and the perfectly clean, subtractive edge-work visible in the side profile distinguish these from generic resin floods or surface-painted imitations.

• High-Density Studio Rhodoid: Boasting a substantial 9.7g weight, these utilize high-pressure baked cellulose acetate. This material provides the necessary structural "memory" to maintain the radical concave curvature without warping or stress-crazing over decades.

Type: Clip-on

Age/Origin: 1980's / Paris, France

Marks: Unmarked (Attributed based on technical "U-Curve" architecture and subsurface fusion unique to the L'Hoir/Schoenlaub studio)

Measurements:

Weight: 9.7g

Thickness: 5mm (at thickest outer edge)

Dimensions: 1.25” diameter

Condition: Excellent Archival Condition. The internal bond remains perfectly stabilized with zero lifting or pigment migration. The high-gloss surface retains a mirror-like luster consistent with well-preserved studio work.