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Need battery number??

What battery does a Heuer 980.027 Dive watch take? It is the dual time with digital and analog circa 1983. I have an Energizer 344 that is in it now, but I can't find one unless I buy one on eBay. I want to make sure that I am getting the correct one. The movement is the
ESA Y2 900 231. Does anyone know the correct battery for this?

Thanks

Ken

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