I'm not a Meerschaum owner or collector. This looks like a good quality pipe, and apparently it's fifty plus years old, if your grandfather stored it. I don't think it is especially valuable. The shape, stem and case are standard. It hasn't been smoked that much. I would guess you might get fifty to one hundred dollars on ebay from the right bidder, but it could be less. Some of our members who specialize in Meerschaum may see something else there that would make the pipe more valuable. My guess is that you should keep this as a family heirloom and don't look for much from a sale.