As a kid my father would take me to one ball game a year. I was a rabid Mets fan. I always bugged him to get there early enough for batting practice, so I could get autographs. I remember Grote as being the guy who would keep signing until the last minute, while chatting with the kids.
He wasn't the biggest star on that team, but he was a very solid catcher. Neither Seaver not Koosman ever shook off his signs. Mistakes weren't a part of his game.