Sometimes weird objects make it onto baseball cards, but there's usually a reason. Player is riding a tractor? Probably used for field maintenance. Using a water gun? To cool off the fans. Holding a surfboard? To advertise for the photographer's brother.
But how does a fishing pole get on the field?
Maybe someone was using it to dangle a card for Ashby to autograph and it fell onto the field?
Christmas in July
39 minutes ago