lot of 8 antique National Cash Register Co keys

For sale... a lot of 8 antique cash register keys from the stash of a locksmith. Three of these keys are marked National Cash Register Co - Dayton, Ohio. The rest of the keys are just marked "National - 2" or "National - 6". They range in size from 1.5" long up to 2.375" long and have a patina of age and some light rust from years in storage.