Hebdomas 8 day vintage gold pocket watch

This Hebdomas 8-day pocket watch has been with my grandpa for decades, and he recently passed away. As we were cleaning his house, we found a couple of his antiques; we discovered this Hebdomas 8 day pocket watch. This one specifically is extremely rare, and barely any were made. It includes the original chain, price tag, and original reciept/paper that came along with it. It is in perfect condition, not a single scratch on it.