Serica Seal Keyring

A compact keyring with the geometry of a scholar's seal reduced to a lightweight hollow brass charm.

• Concept hardware: 25 mm double-coil split ring with a visible loading gap
• Charm: Hollow brushed-brass form, approximately 18 × 18 × 10 mm
• Connection: Saddle-stitched full-grain leather tab with a reinforced brass rivet
• Target weight: Under 30 g

Concept product. Weight, wall thickness, ring strength, leather origin and production partner require engineering validation before commercial release.