The Best Made cover will be pattern number 1242 for a low domed cover No.8 size. Skillets were made in sizes 3-10 and covers in 8-10. The top of the cover will be smooth without any markings I think unless it might have the size marked on top. Inside the markings should be similiar to what your skillet says and there will be basting rings. Handle should look like Griswold's skillet handles. I don't know of a photo but one of the books may have a photo. John Myers in Idaho knows about these Best Made pans but he's not a member currently. I don't know if I have his phone number. Will Person, WAGS member, may know more.
Steve