These came out in 1968, both the coil and sheet type.
1939
There is an 11 cent stamp in the presidential series which was current from 1939 to 1954. First class postage was never 11 cents-it jumped from 10 cent directly to 13 cents.
This stamp (Scott # 1424) came out in 1971 to honor the passing of MacArthur five years earlier.
1996
I just found a listing on ebay saying this series came out in 1973.
This stamp came out on 10/20/1972.
1932
2012
1888
1961
This stamp came out on March 15 (his birthday) in 1967.
United States Postage 3 Cent Indian Centennial Stamp, "The Five Civilized Indian Tribes of Oklahoma, 1848-1948". When was this Stamp Issued?