PLEASE HELP {SUNGLES} Ray-Ban original?

Hey i just got these really awesome pair of aviator real Ray-Ban sun gles from my grandpa well he wore these in the 70's and they are almost in perfect condition!!! gold plated well i just wanted to know how much they are worth or where i could find out how much they are worth!! the ones right now that are kinda the same are from 100-140 so someone please help me out!!!