Please help identify Austrian maker's mark on snuff box

[Gerox]

Hi All,
There is a nice solid snuff box,

marked on the inside with a crab mark, the letter A and the number 4
for Assayoffice Wien and 750 silver fineness.
The maker's mark looks like “JB” might also be “JR”.

I'm hoping one of you knows the maker.
As always, any help will be greatly appreciated.
Gerox

[huszas76]

Maybe Jacob Rosenzweig. Neuwirth: Wiener gold- und silberschmiede ind ihre punzen 1867-1922; 1309.
Best regards!
Krisztián

[Gerox]

Maybe Jacob Rosenzweig. Neuwirth: Wiener gold- und silberschmiede ind ihre punzen 1867-1922; 1309.
Best regards!
Krisztián

Hi Krisztián,
Thank you very much! Perfect as always.... great!
Best regards!
Gerox