Table:
text: Cleveland Open
Winners
Winners
Year_ Winner Country Score To_par _1st_prize_
1972 David Graham Australia 278 −6 30000
1971 Bobby Mitchell United States 262 −22 30000
1970 Bruce Devlin Australia 268 −12 30000
1969 Charles Coody United States 271 −9 22000
1968 Dave Stockton United States 276 −8 22000
1967 Gardner Dickinson United States 271 −9 20700
1966 R. H. Sikes United States 268 −16 20000
1965 Dan Sikes United States 272 −12 25000
1964 Tony Lema United States 270 −14 20000
1963 Arnold Palmer United States 273 −11 22000

Question: From the Cleveland Open list, what is the total number of 1st prizes ($) held by a United States country with a score less than 271 and in a year after 1964 with a winner by Bobby Mitchell?