This is a new old stock fuel or gas tank cap that is Ford brand and part number C2OA-9030-A (replaced by C5AZ-9030A (FC 46).   This fits the following; 1965-70 Ford and Mercury station wagons only; 1961-1965 Thunderbird; 1962-1965 Fairlane (except station wagon); 1966-1969 Fairlane station wagon; 1965-1969 Lincoln.  This is a vented cap.   Part is new old stock and in excellent condition.    Buyer to pay shipping.