Pontiac Star Chief Catalina
The name Catalina was first used on the 1950 Chieftain Series 25/27 hardtop. Originally referred to as 'hard-top convertibles', these vehicles offered pillarless design in the door and window areas, along with the top-grade convertible appointments. The advantage this fixed-roof design offered was its sporty, airy feeling without the expense and drawbacks normally associated with convertibles. With the exception of the 1958 Bonneville, all Pontiac hardtops were designated Catalina from 1950 to 1958. Powered by a flathead straight-8 engine at the time of its debut, it would receive Pontiac's new 287 CID OHV V8 four years later.
Source: Wikipedia, 2011