These 2 models came out in 1957 and followed on from the JP Simplex, using components from the 14" JP Monarch hand mower. The Electric has a Brook Gryphon 1/3 HP motor and being constant speed it ensures a brisk walk behind. The engine of the Power is a Villiers 5G 70cc 2-stroke. They are both rare and only 2 of each version are known. The Power is dated 1957 and the Electric is dated 1962 and so in 5 years there should be more about; it is unrestored. I was told by an ex-employee that the Power was dropped after a year or two as it was considered under-powered, but it's fast enough for me.