Battery replacement Deville

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Hi guys.
A newbie on here, my one and only, Omega, popped up whilst I was looking through my box of motley watches, be nice to strap it on for Christmas, can anyone tell me what battery I would need, pic. Attached
Poor thing probably bottom of the pile in desirability, but it's a start. Many thanks, Ian
 
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Looks like a caliber 1325 so the battery could be an AG3 or equivalent.

The actual caliber should be engraved on the outside caseback and the reference should be on the inside.

We need to see both in order to provide correct advice.
 
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Looks like a caliber 1325 so the battery could be an AG3 or equivalent.

The actual caliber should be engraved on the outside caseback and the reference should be on the inside.

We need to see both in order to provide correct advice.
 
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Many thanks Jimin think it is 1325, couple more pics attached, would this also identify the year ? Many thanks g3jpz
 
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Serial number dates to 1973-74.
 
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Thanks Foo2rama, that's interesting , much appreciated.
 
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While you're in the learning mode, the serial number is here.