TECHNOLOGY
&TECHNIQUE
The assembly process
When the 85 components are ready, they are passed on to CITIZEN’s skilled master craftsmen for hand-assembly. Our craftsmen had to invent entirely new assembly techniques to achieve the record-setting thinness of the watch.
With a 1.00mm thick movement and a 2.98 mm case, Eco-Drive One is the world’s thinnest light-powered watch. We succeeded in making it because CITIZEN is a manufacture d’horlogerie, doing everything from making the individual parts to performing final assembly in-house.
![[1]The 1.00mm movement](/one/images/modal/technique_nav_txt01.svg)
![[1]The 1.00mm movement](/one/images/modal/technique_nav_txt01_sp.svg)
![[2]The materials for the 2.98mm case](/one/images/modal/technique_nav_txt02.svg)
![[2]The materials for the 2.98mm case](/one/images/modal/technique_nav_txt02_sp.svg)
![[3]The assembly process](/one/images/modal/technique_nav_txt03.svg)
![[3]The assembly process](/one/images/modal/technique_nav_txt03_sp.svg)
![[4]Eco-Drive: Powered by any kind of light.](/one/images/modal/technique_nav_txt04.svg)
![[4]Eco-Drive: Powered by any kind of light.](/one/images/modal/technique_nav_txt04_sp.svg)