John Deere in chronological order

Diesel narrow single front wheel.

Diesel standard tread.

Diesel wide, adjustable front end.

Hi-Crop.

Serial number 60001 was the first Model 40H, built August 27, 1954.

Serial number 60294 was the last Model 40H, built October 17,1955.

Serial numbers: 7017500-7043757.

Fuel: diesel (run)/gasoline (start).

S/n 7017500 was the 1st Model 70D, built September 14, 1954.

S/n 7043757 was the last gasoline Model 70DS, built July 20, 1956.