Oh man tough choice I have always been one to appreciate new old stock items. I would love to know the story behind those types of things. Did it not sell, did someone buy it and never use it, or did a store go out of business?
Unless you are a serious collector and purchased it for that reason, then use it, and enjoy!!
He could make his own ​and save his relationship. Heck, make her some nice bath soap and she will love him forever.Maybe you use it and it ruins you for all other soaps? Then you've got to track down vintage williams every few months. Your wife/girlfriend leaves you. You wind up on the streets, washing windshields with modern williams to afford a puck of the good stuff.
I say it's better not to know.
He could make his own ​and save his relationship. Heck, make her some nice bath soap and she will love him forever.
Who's got the time and patience to do something like that. Would take some kind of loonie to make his own shaving soap.