Horology Zone Free Watch School
Watch Repair Tools Shop

Free Watch School Repairing Tools Shop

Horology A ~ Z

Horology U
 
Ultra-thin

An ultra-thin watch is a watch whose size and thickness have been reduced to an absolute minimum. Watchmakers consider the bulk of the work to be in the miniaturization of the parts, rather than in actual complicated watch work.

In 1903, JLC designed a 1.38 mm thick pocket watch movement.
In 1925, AP made a 1.32 mm pocket watch movement, Blancpain made a 1.75 mm thick wristwatch.

 
Uni-directional winding An automatic mechanism that only winds the mainspring when the rotor is turning in one direction.
 
Up and Down Indicator Indicates power reserve
 

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