Not sure what the car is, may be a Vauxhall according to the ad? But this looks like a lock with 2 keyholes on the C pillar?
https://www.kijiji.ca/v-classic-cars/yarmouth/old-trucks-cars-for-parts/1563462410
Never mind, its a locking gas cap, see other pic.
63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC. 1963- Pontiac top selling car in Canada
Mahone Bay, NS Still not old enough to need an automatic
Locking gas cap door on a Early to mid 80s Fiat ?Or possibly Lada.My 80s gas pump attendant life is haunting me
The decade of locking gas doors !
https://canadianponcho.activeboard.com/t63333628/click-here-to-support-canadian-poncho/
see2xu
66 Beau 2DHT 427FI, 700R