Both the Rapid and the Prima are easy to spot. They are the only Contaflex models to have their name engraved on the front of the prism in script lettering.
The Rapid was product code 10.1261, and is rarely found. It is listed in the May 1960 catalog for $169, only $30 less than the Super, and essentially the same as the Super except lacking the built in selenium light meter. It was discontinued in 1961.
The Prima was a continuation of the Alpha and Beta, with a Rodenstock Pantar lens in a less expensive Prontor shutter. The Prima has a built in selenium meter like the Beta, but without the flip up cover. The product code is 10.1291, and it was marketed until 1965, and was the final model of the Pantar/Prontor Contaflex.
The Contaflex Rapid
The Contaflex Prima