Twin City 12-20
VerifiedThe Twin City 12-20 was Minneapolis Steel & Machinery’s most popular Twin City tractor and an engineering standout — built 1918–1926 by one of Minneapolis-Moline’s predecessor companies.
Identification & configuration
Per the compiled Twin City record, the 12-20 used a notable twin-cam, 16-valve four-cylinder engine (4¼ × 6 bore/stroke, ~340 cubic inches), and about 9,000 were built — making it the most common Twin City model.
It is a direct MM predecessor; see the Twin City tractors overview and how the predecessors merged into MM.
Factory paint
Per the MMCI paint records, Twin City tractors of this era (including the 12-20) were Battleship Gray overall, with red lettering on the top radiator tank. See the full paint reference.
What to verify
- Serial: the 12-20 ran serials 10201–19219; decode yours (ranges below).
- Engine: confirm the 16-valve twin-cam four — a defining feature of the model.
Sources & Verification Notes
Engine spec, production figure, and serials per Tony Thompson’s compiled Twin City record (hosted by MMCI); paint per the MMCI Paint Committee. We do not assert horsepower figures, and we flag production counts as collector-reported until confirmed against factory literature.
Serial Number Ranges
| Year | Serial range | Number type | Source confidence |
|---|---|---|---|
| — | 10201 – 19219 | tractor plate | Verified High |
| 1925 | 20001 – 20012 | tractor plate | Verified High |
Factory Paint Colors
Body, wheel, and powertrain colors documented for this model's era by the MMCI Paint Committee. The exact part-by-part configuration, year breaks, and footnotes are in the full paint reference. Individual tractors vary — special orders and regional exceptions were common, so confirm against your own machine.
- Battleship Gray (body)
Finding Parts
We don't publish part numbers we can't verify against factory literature. The authority for this model's part numbers is its factory parts catalog; interchange is serial- and configuration-dependent, so always confirm against the parts book before buying.
Surviving Examples (collector-reported census)
No tractors registered for this model yet. The MinnieMo registry is owner-submitted and moderator-reviewed — help start the census.
Sources & Verification Notes
Status: Verified
Primary source: Twin City Tractor Serial Numbers — Tony Thompson (MMCI) tier 2
Last checked: 2026-05-31