Watch Glossary
1676 horological terms explained · 5/5
Dial with cross or target pattern in center for vintage military style
Knob on the case used to wind the watch and adjust the time.
Non-standard crown position at the bottom of the case, reducing accidental crown bumps while worn.
Crown positioned on the left side of the case, designed for comfortable left-handed operation.
Measurement of crown accessibility, size, and grip comfort relative to case proportions
Elastomer seal preventing moisture entry through crown tube
Protective structure around the crown to prevent accidental damage.
Analysis of crown guard wear patterns to verify actual historical usage levels.
Protective extensions or shield around the crown preventing accidental bumps and damage.
Specialized tool for extracting watch crown with minimal damage to threads
Sloped or angular sections connecting the crown to the case.
Internal stem that connects the crown to the movement.
Vertical crown-up position used in timing measurement protocol.
Transparent cover protecting the dial, typically sapphire or mineral glass.
Precision guidance collar in case presses that aligns watch crystals before pressing operations.
Recessed channel in case middle holding crystal edge
Replacement of watch face glass or plastic when scratched or broken
Beveled metal ring compressing crystal into case with precise pressure
Moment when chronograph hand reaches maximum measurement capacity
Cushion-shaped case with curved sides and rounded corners
Rounded square case shape with softly curved corners, popular in vintage and modern watches.
Dial specifically designed for individual client specifications
Uniquely designed hour indices created for specific model
Magnifying lens over date window, standard Rolex feature magnifying by 2.5x.
Rolex's magnifying lens over date window magnifying by 2.5 times
Magnifying lens over date window enlarging numerals 2.5 times
Air viscosity influence on cylinder escapement performance within sealed balance cock cavity.
Standardized measurement procedure for lift clearance between cylinder and escape wheel teeth.
Quantification of backward wheel motion during cylinder escapement lock phase.
Curved surface profile refinement of escape wheel teeth for cylinder escapement efficiency.
Balance wheel with drum-shaped mass distribution design
Standard rounded pivot point between movement components