1970-75 Pearson 33 or 1970 Columbia 36
Pearson built two different 33 footers during the period 1970 to 1973. The first was the Pearson 33 which was a centerboard boat that replaced the Pearson Vanguard starting in 1968 or 1969 I believe. These were late CCA boats with large cockpits and comparably small interiors. They were mediocre sailers and were sort of middle of the road in terms of build quality. They had pretty heavy glass work but were not expecially well engineered.
The Pearson 33 was replaced with the Pearson 10M (which was also called a Pearson 33 in some circles)in 1972 or so. This was a big version of the Pearson 30. These are very nice sailing boats and except for the out-turned hull to deck joint, were better engineered than their predecessor.
The late 1960''s and the early 1970''s was not a great period for Columbia. The 36 was one of the nicer boats that they built but they were not all that well built and by the early 1970''s the design was quite dated.