Or calligraphy pen. The forger is even more of a tool than the writing implement! 

https://www.ebay.com/itm/Babe-Ruth-Signed-Baseball/163904577966?has...

"At a local garage sale an older man had tons of baseball stuff in a box for sale, I bought the box of stuff and this autographed ball was in there."

He wasn't quite old enough, I would say. lol