Rare and early Ping Redwood City Mod IV A pat pending bronzed brass mallet head putter - the sole to the face is stamped "Ping by Karsten" - the raised chamfered sole bar is stamped "A - Mod IV - 14" and the cavity centre with "Pat Pend - PO Box 503-Redwood City-Calif" fitted with the original shaft and "Golf Pride" red rubberised pistol grip