Northernman
··LemaniacA month ago I found my F300 stopped, so I took it to my watchmaker for a change of batteries (I know better than opening one of'em fork things), and I was scared sockless when he told me that it did not work...
We had been talking about the old mercury based 1.35 batteries, and he told me he still had some somewhere around his shop, but that the F300 did not need those old batteries. He kept the watch, I went home worried, because I quite like my Geneve F300, but I am not ready to buy another one, and I didn't know where to take it (my watchmaker had already told me he wouldn't touch a F300 with a barge pole, "been there, bought the microscope and got fed up to the teeth" were his words, only in Spanish we are way more vernacularly colourful, not Aussy colourful, but getting there).
When I got back the next day, he was as puzzled as me. He had put one of those old 1,35 batteries in the thing, and it went buzzing like there was no tomorrow. I hope he has more of those next time.
Batteries are a thing of the devil.
Hi!
No need to go the 1.35V way. All of my f300hz watches are running on modern cells, and doing it well.
The Bulova 21x calibers seem more sensitive to the voltage than the ETA/ESA (f300) ones.
If you need to service it I would strongly recommend to ship it to this guy in the UK. He will put it right at reasonable money:
http://www.electric-watches.co.uk/omega-f300-repair-accutron-repair.php
BTW: Here is the Omega official bulletin regarding changing to modern (1.55V) batteries on the f300 and other calibers: