1989 Omega Seamaster 2065.80 Professional 300M

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Hi all:
I am trying to find the correct replacement battery for the watch I purchased. I assume the battery died because the watch has stopped. I have not tried to open the case. I can sure use some help with this.
Thanks,
RJ
 
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20658000 will need a 371
 
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If you show a photo, it will simplify the task for finding tips. And with a photo, the forum topic looks more interesting