Watch Glossary

Software function measuring balance wheel rate variation across different amplitude ranges during testing.

Standardized procedure ensuring consistent acoustic signal detection across different watch movement types.

Multiple electromagnetic or optical sensors in timing machines that detect and measure balance wheel vibrations.

Lightweight, hypoallergenic metal alloy offering excellent strength and corrosion resistance

Lightweight metal bracelet, superior strength-to-weight ratio, hypoallergenic

Medical-grade titanium alloy offering superior strength-to-weight ratio and hypoallergenic properties.

Barrel-shaped case wider at the center and tapered at the lugs, resembling a wine barrel.

Robust, functional watch designed for professional or demanding work conditions

Shape of gear teeth affecting smoothness and efficiency of power transmission

Buffed leather layer below full-grain, smooth finish, moderate durability

Mechanism encasing the balance wheel assembly in rotating cage to counteract gravity effects.

Rare watch manufactured during factory production change, serving as authentication standard for collectors.

Dial design between major production eras, combining features of both generations.

Three gasket seals providing maximum water protection on diver's watches.

Rolex's triple waterproofing crown system for deep diving watches

Radioactive luminous material used in watch dials from 1960s-1990s, safer than radium

Gradual reduction in luminescence brightness of tritium-based watch dials at approximately 5.5% per year

Dial coated with tritium, a radioactive hydrogen isotope providing continuous glow without light exposure

Measurement of remaining luminosity in tritium-based lume indicating age authenticity.

Radioactive luminous material used in vintage watches, glows without recharging.

Sealed glass or metal tube filled with tritium gas used for constant watch dial luminescence

Rubber strap with drainage holes, ideal for water sports and humid conditions

Vintage dial with distinctive brown patina from age and UV exposure

Collector slang for dials developing brown staining from decades-long ultraviolet exposure.

Luminous material that faded from original bright white or cream to warm brownish tones

Seconds hand that advances in one-second jumps at specific intervals, also called dead beat.

Barrel polishing process tumbling watch parts with abrasive media for uniform finishing.

Rolex's double waterproofing system for the crown protecting the watch

Case design consisting of a case middle and caseback, with the crystal fitted into the middle.

Separate sections for each side of watch, allows easy change and cleaning

Mixed metal bracelet combining gold and stainless steel for hybrid aesthetic

Minimalist collecting approach; typically one dress and one sports watch