In 1961, shortly after Karsten had moved to Arizona from California, Karsten came out with Ping 69 T (thin) putter.  This fine example has its original 35 1/2" shaft with double bend neck and Golf Pride Informer grip. The inside of the back cavity is marked with Ping's Scottsdale address. 

The extra feature of this particular putter is its shaft band. The font and layout of this "Tuned Balnamic" band was not in use for a long time.

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 2200-square-foot building in Phoenix. That is when Karsten started making his putters with the Phoenix address.