Rare and early Ping Redwood City Mod. AX - pat pending centre shaft rectangular shaped brass putter - the front and rear soles are stamped "Ping by Karsten" to the one and "Redwood City California Pat Pend" to the other and the full raised centre chamfered sole plate stamped "A X" to the heel and the number "9" to the toe - fitted with the original shaft and Golf Pride flat face thumb grip (some perishing)