Right! The Airmaster! I'd forgotten about them.
I did a little more research on the Cessna 160. It was a prototype 4-place airplane supposed to fill the niche between 150's and 172's, powered by a 125 hp Franklin engine, and cruised at 134 mph. They considered a military version with a 210 hp IO-360 that in theory would have pushed the envelope to a 174 mph cruise.
There are reports that the prototype was scrapped, but supposedly a mechanic in Kansas now owns the remains of this one-off airframe. Cessna still should have used the 160 designator for the LSA (It wouldn't be the first time they used a designator twice!)
Cessna History Project (old thread). 
