Some John Deere trivia:
The Model A was built from 1934 to 1952. 2-cylinder, 321 cubic-inch, which put out over 34 HP. Over 300,000 were sold.
The Model B was built from 1935 to 1952. Still a 2-cylinder, but with a 190 cubic-inch motor yielding over 24 HP. Over 300,000 sold.
The B was...