Best guess was 25 of the Cheney Sachs frames were built. I don't believe Eric was all that thrilled about producing a small (schoolboy) two-stroke, but my father was pretty convincing.
In front of Cheney Works March 1972 with the prototype:
Frame #1 prototype Rec'd in the states April 1972.
Frame #2, #3, #4 Rec'd in the states July 1972.
Current collection frame #14 rec'd Dec. 1972 and GP#1 found last year at Cycle News California.
As seen in VMX and one of my racers.