Member of the King Regula series, produced from 1956 to 1959. This version has a Gossen built-in light meter, but no frame lines in the viewfinder. A series of lenses, from 28mm to 135mm, were produced for this interchangeable lens rangefinder.

• Standard Lens: Enna Werk 50mm f2.8 Regula-Ennit C (4 elements, 3 groups, Tessar-Style)
• Shutter: Prontor-SVS, 1s - 1/300th, plus B
• Light meter: Uncoupled Gossen, reading in EVs to be transferred to the synch system on the Prontor shutter. Dual stage, with a hole in the cover.
• ISO Range: 6 - 1600
• Viewfinder: Center-mounted reverse-contrast, with slghtly warm frame and lighter, circular rangefinder patch.