At this late date, I'd regard those Sony batteries as collectables!
Sony's battery business was acquired in 2017 by Mu-rata and so the batteries now say Mu-rata.
www.laval-europe.com
SONY and MURATA
Where did the Sony button cells go?
In 2017, Murata acquired Sony's battery and accumulator division and took over manufacturing of the Sony brand.
Since then, the Murata brand has replaced the Sony brand, but
the quality and performance of the batteries remain unchanged .
Quality: no changes
The batteries now carry the Murata brand but continue to be manufactured in the same factories, by the same production teams who still follow the same strict quality procedures.
Performance: no changes
Murata 's mercury-free high-performance
button cell batteries are globally recognized by leading watch movement manufacturers, covering approximately 45% of global demand.
MURATA IS THE WORLD'S N°1 PRODUCER OF WATCH BATTERIES.
- Inventor of the mercury-free silver oxide watch battery
- Renowned supplier to global watch movement manufacturers
- Over 40 years of manufacturing experience
- Over 1 billion watch batteries produced
Namely: Murata batteries combine perfectly with Miyota movements.