Mickey Mantle clubbed 536 career HR's . His last victim was lanky Red Sox righty Jim Lonborg. Showing no hard feelings, Longborg has signed this Mantle Cooperstown Collection Jersey: " Jim Longborg" along the top half of the "7" and "I threw Mantle's Last HR # 536 9-20-68" up the "7" in silver paint ink. Signature is an 8 of 10.