Collateral stamp (actually a cinderella) issued by Flying A Gasoline Co., aka Tidewater Oil Co., to promote automobile tourism, 1938.
No. 133 in a series of (reportedly) 200 shows Fort Tejon. The stamps were collected and pasted into albums.
As a medal is to a coin, a cinderella is an item that looks like a stamp but is not a stamp. It bears no denomination and is not issued by the goverment for use in paying postage, taxes or fees.
LW3146: 9600 dpi jpeg from original item purchased 2017 by Leon Worden.