I found John Emerick Nunnemacker's will on the Buck's county site (it changed since you posted the link--but I found it. thank you)
It look like John's wife Judith inherited the land prior to their marriage. It also looks like the will was executed in Buck's Co, but John lived in Rock Hill which was Huntingdon Co. If the land went to Judith prior to the marriage then it would have been pre 1735+-. Do you know what land or land grant records are available for that era for Buck's Co? I am assuming that Judith was an only child or at the very least had no brothers for the land to pass to her. Her father was most likely one of the first settlers, had land granted to him and he died widowed, with no sons. From that record, we could get Judith's maiden name and her father's name. I am in MA and don't know what records are available. You've done quite a bit of Sheetz research and I'd like your thoughts.