The 12hp was a car built by Deemster from 1922 onwards.

The 12hp had a larger engine than the one used in the 10hp. It used an Anzani 1496cc four cylinder engine. It was capable of acclerating the car to well over 50mph (80kmh),

Kaye Don lapped Brooklands at 92mph (148kmh) in 1923. His car had single-seater bodywork, highly tuned engine and high-lift camshaft.