In 1961, shortly after Karsten had moved to Arizona from California, Karsten came out with Ping 69 FT (Flat Top) putter.  This brilliant example has its original 35 3/4" shaft with a two-way grip bend as well as its "Tuned Ballnamic" shaft band.  The Golf Pride Informer grip is also original. The inside of the back cavity, which has darkened with age, is marked with Ping's Scottsdale address. 

As mentioned, this putter has Karsten's unique two-way bend at the base of the grip, which, when compared to the central length of the shaft below the grip, bends both away from the target and away from the ball.  The neck also has a distinct bend. All these bends were made by hand by Karsten in his garage. Heat and ingenuity did the trick.

When Karsten moved to Paradise Valley, a suburb of Phoenix in 1960, he set up a Post Office box in Scottsdale in order to differentiate his business address from another putter maker operating in Phoenix—John Reuter, Jr., the maker of the Bulls-Eye line.  Karsten marked all of his clubs with the Scottsdale address so anybody who saw another golfer using a PING putter would know where to write to place an order. In late 1966, Karsten moved from his garage to a small commercial building in Phoenix.