Oliver model 33 (runs!!!)

The machine in the photo is an Oliver Model 33 self‑propelled “Grain Master” combine from the early‑to‑mid 1950s, most likely built between about 1950 and 1955.

Year and production

• The Model 33 was Oliver’s first self‑propelled combine and was produced only a few years before being replaced by the Model 35 around 1955.

• Most tagged examples you’ll see advertised today are 1952–1954 machines, so yours will fall in that narrow early‑1950s window based on the design.

Engine and basic specs

• Contemporary Oliver literature and owner reports indicate the 33 used a Continental “F‑226” flathead 6‑cylinder gasoline engine (226 cubic inches, about 3.7 L), shared with the later Model 35 combine.

• That engine was rated in the 40–45 hp range at the combine’s rated speed, which matched the needs of a 10–12 ft class machine of the time.

• The 33 was typically equipped with a 10‑ or 12‑foot platform; your header size can be measured between dividers to confirm which version you have.