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The Coronet Twelve-20 was a pseudo-TLR made by Coronet in Birmingham, UK, c.1950. There were two models, the basic and the Colour Filter Model - which had a green filter. The Coronet D-20 is similar to filter model, but with flash sync replacing the two-position focus setting. The body construction had a metal frame and sides, with cardboard making up the front, back top and bottom.

The Twelve-20 took 2¼×2¼-inch (6x6cm) images on either 120 or 620 film. The shutter had instantaneous and B settings. The basic model had two apertures selected by a slider above the shutter release.

McKeown reports that the Twelve-20 was available in a number of colours.