The following description was taken from Grand Old Toys.com.
This set of toy farm implements by Marx is the largest, most complete, and highest grade I've found to date. I have found larger sets, but nothing to compare with the incredible high grade of this one. It grades slightly above excellent+, or just below near mint. The entire playset comes complete with its original "building" box, plus all five of its original inserts.
From my research, the clue to identifying the period which this set was manufactured is the inclusion of a little known implement called the stone "boat". In the first photo it's the red, sled-looking implement on the right side. It was available for only one year, 1939, exclusively through the Sears-Roebuck Christmas catalog. The stone boat is wooden with a metal hitch. Farms would use it to haul stones away from a field before planting, or to help build a stone wall, or to install erosion preventing gullies.
Box was printed in red and green to resemble trailer shed. Interior flaps are die cut so that when folded will form a pitched roof. They've never been folded. Images of farm workers performing various manual activities were printed. A tire hanging on the wall and a large "battery" were also shown. Includes five plain cardboard inserts. This was the total number used when the toy was produced. None are missing.
Tractor
Central to the toy is the unique addition of its copper finished tractor. Its powered by a strong clockwork motor with an internal governor which allowed for maximum torque when towing heavier loads. That's a fancy way of saying that it wouldn't unwind all at once, but instead disperse slowly and with more power than a standard clockwork motor. It was advertised as being able to run about 14 feet on one winding. The copper finish exterior is all tin litho. The wheels are all metal and finished in the same copper color. Under the hood, the motor is shielded inside of a steel housing. Just below the front radiator is a slot which provides a connection point for the road scraper. The rear has an integrated steel double hitch. The key is attached and it has a start/stop lever just to the right of the driver. The treads are solid black rubber and both are original to the toy. Size: 8½".
Driver
Early style tin litho with knee high laced blue boots, brown trousers, blue shirts with yellow cuffs, red bandanna and wide brimmed hat. Size: 3½"
Four wheel steel trailer
Heavy gauge steel painted silver with movable hitch. Stake rail style with four solid black wooden tires having red, tin litho Girard style wheel hubs. Marx, post 1939 logo stamped into center of the trailer bed. Size: 7½".
Road Scraper
Unlike many plows or scrapers found in Marx sets this one is completely made from polished tin, no plating, steel, or aluminum was used. Size: 5½".
Cornplanter, red and yellow die cut 10 lithograph with two gravity, fed quote, feeders". Each feeder is stocked with its original silver painted wooden containers wheels are tin, lithograph, steel rod on the right side, raises and lowers, used to measure the distance between the rows of corn.it
Two wheel tilting trailer, yellow interior, red exterior with balloon style white tin lithograph threaded wheels. Hitching bar in front. Size 6 in
10 disc, Haro pressed steel, painted with yellow enamel, having two groups of five rotating circular "blade" size 5 and three-quarter inches
Lower with cutting blade, yellow and red embossed tin lithograph with sliding blade cutter. White balloon style tires with gears blade attachment. 8 1/2 inches wide.
Stone boat, red tinted wood, size 6 and three-quarter inches long
Gang plow enameled press deal with pressed tin lithograph disc wheels, two gang plow style 6 1/2 inches long
Pitchfork, polished, pressed steel for and a quarter inches long
Hate rake the largest implement with this toy. All tin lithograph with 10 semi circular rake, things and yellow cross braces. Wheels are in Boston lithographed 10, solid with black lithograph spokes large chrome, polished steel, hitching, rod, 6 inches wide.