Omega Cal.1325 Battery

[GC8]

As title; can anyone point me towards a reference or tell me which battery this calibre takes, please?

Omega were rightly proud of this early quartz action, which benefited from 15 jewels and was advertised as being accurate to within one minute a year (actually 'five seconds per month').

Hours and date are adjusted using the crown in the conventional manner, but minutes are advanced by depressing a button in the centre of the crown; with one revolution taking about 20 seconds.

Any help gratefully received.

[Ikemi]

This PDF seems to recommend a change from mercury-oxide to silver-oxide batteries - It also mentions the Cal.1325 movement and the replacement battery manufacturer/type:

http://www.google.co.uk/url?sa=t&source=web&am...

384 Renata 'coin' watch battery:

http://www.allbatteries.co.uk/primary-battery/butt...

[GC8]

Thank you!