PB wanted some old tractor pics. These are from my dad's collection. I don't have very many good ones. They are currently in the Hale County Farm and Ranch Museum at Hale Center, or inside one of his barns. So no way to get a decent pic. If anyone cares, I can look for some others taken in the past years.
1938 John Deere (unstyled) Model L, second year of production, there were only about 3500 made that year, less than 3600 total unstyled made in 1937 and 1938. So it's a bit of a rare bird.

John Deere Unstyled L by CHS Girls Soccer, on Flickr

John Deere Unstyled L by CHS Girls Soccer, on Flickr
The next two were made by The Gibson Tractor company between 1946 and 1957. Gibson was based out of Longmont, Colorado. Total production of all types of Gibsons was about 50,000-60,000 units.
Note it steers with a lever, not a wheel.

Gibson A by CHS Girls Soccer, on Flickr

Gibson Super D-2 by CHS Girls Soccer, on Flickr
Below is a 1938 John Deere G, the first year of production. One of 6734 made that year.

1938 unstyled G John Deere by CHS Girls Soccer, on Flickr
1938 John Deere (unstyled) Model L, second year of production, there were only about 3500 made that year, less than 3600 total unstyled made in 1937 and 1938. So it's a bit of a rare bird.

John Deere Unstyled L by CHS Girls Soccer, on Flickr

John Deere Unstyled L by CHS Girls Soccer, on Flickr
The next two were made by The Gibson Tractor company between 1946 and 1957. Gibson was based out of Longmont, Colorado. Total production of all types of Gibsons was about 50,000-60,000 units.
quote:
The first production tractor was a model 'A' which, along with the latter models 'D', 'SD' , and Super D, was powered with a six horsepower Wisconsin air cooled model AEH engine (some early 'Ds' had a nine HP AHH engine). The model 'A' had 7.50 x 16 rear tires and 4.00 x 12 front tires. It came with a three speed transmission and two independent rear wheel brakes. Its wheelbase was 42" and it weighed 875 lbs. It came with a full range of implements and was touted as being able to operate a 13 1/2 " plow and handle two to three acres per 10 hour day. Under maximum load, fuel consumption was one and one half quarts per hour.
Note it steers with a lever, not a wheel.

Gibson A by CHS Girls Soccer, on Flickr
quote:
The model 'SD' followed and was distinguished by having a hood, grill and fenders. The 'SD' tipped the scales at 1065 pounds.
All three models had a of these distinctive characteristic of being steered with a lever. It was mounted on the right side of the frame, by pushing it forward, the tractor turned left. Pulling it back was necessary to turn right. This design was probably chosen for a combination of reasons including uniqueness, simplicity, quickness and cost effect production rates.
The Super 'D' introduced the steering wheel design but kept most of the other features of the 'SD' including the AEH engine, hood, grill and fenders. Electrical and hydraulic systems were optional and added to its 1105-pound weight.
The Super'D2" was also a steering wheel model and boasted a two cylinder, 12 horsepower model TF Wisconsin air cooled engine. On a 52" wheelbase, it weighted 1375 pounds. It rolled on 7, 8 or 9.00 x 24 rears and 4.00 x 12 fronts.

Gibson Super D-2 by CHS Girls Soccer, on Flickr
Below is a 1938 John Deere G, the first year of production. One of 6734 made that year.

1938 unstyled G John Deere by CHS Girls Soccer, on Flickr