XThunderbird 1961 Torqueflight Double Bubbletop.Both Bubbletops are side by side and encased in this chrome frame for strength and beauty.This car was made before 1961 Thunderbird which came in hardtop,convertible or speedster. From the 1920s to 1970s they were called "Experimental" cars. http://x61thunderbirdbubbletop.blogspot.com/