Bringuing back to life: Citizen WR 100 "pepsi" , which cell?

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Hi folks 😀, I found this old Citizen and would like to wear it. I dont trust the watchmakers here (in southern France supermarkets) too much so please: were can I find the correct cell (www?, series number of the cell?) of this WR 100?
The case was "empty" 😉
movement 5500 , stamped GN-4-S , 840152 on the case and : M (H?) 02541 KA on the dial.


Any help (year of production , 1986?? ) appreciated,
Jo
 
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From the Citizen specification sheet, that's correct:
Good luck, Chris