Red Delicious
The Red Delicious is a clone of apple cultigen, now comprising more than 50 cultivars, first recognized in Madison County, Iowa, in 1880. According to the US Apple Association website, it is one of the fifteen most popular apple cultivars in the United States.
Mutsu (apple)
The apple (also known as Crispin) was introduced in 1948 and is a cross between the 'Golden Delicious' and the 'Indo' apple cultivars first grown in Japan, and named after the Mutsu Province of Japan.