Marked "Pat Pend." and "Ping by Karsten,"  this putter is not marked with a Redwood City address or any other. The B5 was only made while Karsten was in Redwood City.  He did not produce a B5 with a Scottsdale or Phoenix address.  So, why is there no address on this club? It is possible but extremely unlikely that the club was an early prototype. Karsten was very religious about including his address on his clubs. 

The auctioneer is confident that this club was cast while Karsten was living in Redwood city but sold just after he moved to Arizona, so he needed to remove the "Redwood City" address marked on the club before he could sell it. Upon close inspection (with magnification helps), its clear that the address in the cavity was ground off. Only Karsten would have done the grinding and only Karsten put the bends in the early shafts—both were procedures done by hand. Because Karsten ground off the address soon after the head was cast, the entire head has the exact same patina.

The original Golf Pride Informer grip and PING's black trim collar are on this club, which shows very little to no use.

This "no address" Redwood City putter is among the absolute rarest of early PING clubs. Its always a joy to handle a putter on which Karsten spent extra time.