The worth of the cigarette box

Hi, can someone help please with the approximate value of this cigarette box Birmingham, 1911
It’s in very good condition, plain silver with no craft work, wood inside.
Thank you. P.

Hello, the silversmith is George Nathan & Ridley Hayes.

Thank you. And how much could be it’s value on the auction?

I would put the weight of the box X the value of the silver as the minimum value.