I was looking at 1 of my card and it looked a little funny

I was looking at 1 of my card and it looked a little funny.....its a first edition jungle Butterfree......but in stead of the 1 in the first edtion spot it looks more like a.....d

ANY SUGESTION ON WHAT IT MIGHT BE?

One of the first known misprints is the "d" Butterfree. This was caused from some dirt on the press, causing the "1" to look like a "d". The card, while an error, if not that uncommon, and thus only worth about 1 1/2 to 2 times the normal value, probably not worth more than about $2.

Scott