these stamps have interesting cancels, and they appear as if they could be precancels, but from what I know, they are probably not. But are there perhaps any among them that are (perhaps local) precancels?
Altoona PA (2 stamps - parcel roller cancel?)
Philadelphia PA (local precancel, but vertical?)
Northbrook ILL (roller cancel?)
Campello Station (interesting, machine cancel?)
Waldoboro Maine (interesting, but also a roller cancel?)