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Watch Glossary

1104 horological terms explained

Leather StrapMaterials

Natural or synthetic material used for classic dress watch bracelets

LiquidmetalMaterials

Amorphous metal alloy used for watch bezels and components, offering extreme hardness and durability.

Lume (Luminous Material)Materials

Radioactive or photoluminescent coating on hands and indices for night visibility

Lume applicationMaterials

Process of applying luminous material to watch dials, hands, and hour markers

Lume compatibilityMaterials

Quality of luminous material to adhere properly to dial surface without peeling or degrading

Lume coverageMaterials

Percentage and area of watch dial, hands, and indices coated with luminous material

Lume fillMaterials

Process of filling dial cutouts with luminous material for enhanced visibility and aesthetics

Lume permanenceMaterials

Resistance of luminous coatings to fading, degradation, and environmental exposure over time

Lume thicknessMaterials

Amount of luminous material applied to watch components affecting brightness and durability

LumibriteMaterials

Seiko's luminous coating providing bright glow and long-lasting luminescence on watch dials