Watch Glossary

GMT-Master II with red and blue bezel insert, nicknamed for Pepsi-like color scheme.

Small rounded points on watch components that allow smooth rotation in jeweled bearings

Portable timepiece carried in pocket, popular from 17th century until wristwatch era.

Timekeeping variation depending on the position or orientation of the watch mechanism

Documented ownership history from manufacture through current owner.

Vintage dial with radioactive radium-based lume, highly collectible and dangerous.

Vintage Submariner with red text dial printing, collectible early reference variant.

Adjustable pointer that alters effective length of balance spring to regulate rate

GMT-Master II with brown and black bezel insert, resembling root beer coloring.

Long-term changes in watch accuracy caused by wear, aging, and environmental factors

Auction term for letters, receipts, and service records proving professional maintenance chain.

Specialized steel alloy used in hairsprings and mainsprings for its elasticity and durability

Elegant S-shaped bracket used to adjust the hairspring length for fine timekeeping adjustments

Mechanism to counteract effects of temperature changes on timekeeping accuracy

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

Early escapement mechanism using a rotating verge to regulate energy release from mainspring

Early Submariner with disproportionately wide case, reference 5508 and 5510.