IL020 Jumping Hour Watch

Here is the specification.

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WIDTH : 40mm
HEIGHT : 10.8mm
LUG to LUG : 49mm
LUG WIDTH : 22mm

CASE : Stainless steel
MOVEMENT : Swiss ETA2801 + Handmade jumping hour module
CRYSTAL : Sapphire

DIAL : Brass and Blue-steel
HANDS : Polished steel
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PRICE : -under consideration-


Generally jumping-hour model has a disk-dial. But I wanted the appearance unlike a general one.

When the minute hand rotated in one hour, the hour hand jump to next hour marker quickly.
The jumping action is caused by linkage of three star-wheels and one push wheel. They are controlled by spring levers. I had a hard time to decide the strength of the spring.

I chose ETA2801 hand-winding as a base movement, because I wanted to build this model as thinly as possible. The jumping-hour module needs a certain thickness. When automatic mov is adopted, the stainless case will thicken more than 1.xxmm.  The difference is huge, I suppose.
(The movement in this photo is temporary. Its decoration is going to be changed...)
Brass inner holder has 'Pelrage'.

Polished steel hands, wheels, jumpers were made by my hand. Dial is composed from sand-blast finished brass base and blue steel index plate.

 The side of the lug is sand-blasted too. I used garnet sand.

My wrist is thin. But wearing feel is good!

Jumping Hour Module

After some design changes from a stage of the trial production the module was completed.
Speaking of jumping hour watch, the disk dial is usually used. But I dare to choose simple two hands indication. I think that it is interesting you cannot recognize this watch as a jumping hour model when you glance at it.

All module parts were made from brass and steel by my hand. They are still temporarily assembled.

Base movement is ETA2801.

Here is the movie of hand jumping.