Hi,

Some years ago, I found information on line about my REICHZELIGMAN family, that had died in Zurich,

I wrote to the archives and they were very helpful.

Having said all that, I would suggest you write to the State Archives in Bern
https://www.sta.be.ch/sta/en/index/staatsarchiv/staatsarchiv/genealogie.html

They might be able to help you!

Regards
Angie Elfassi
Israel