I have from my granfather an old african mask, i know it is one of a kind, and i know it is autentic,and i know it is worth a lot of money, but i dont know exactly how mutch

It is an african war mask, i got it from my granfather, he was a sailor in the 60’s and 70’s. This mask have been in a basement for 30 yrs, i have an norwegian expert opinion, this is from Elise Schanke And she says! quotation: It's probably from Ivory Coast, does not remember the tribe on the go. It's a war mask that has remained incredibly good. Has a calming, but the tooth of the time had touched that skin and has gone away. It sees it to have been in use and is therefore valuable. Good luck!