@Kirkuleez, you are correct! 12 is the correct answer. It is a '26 Plain Buff, in case anyone wanted to know. I could tell because of the slightly lighter rim.
I was going to say 9 because of the spot on it, but you already hinted 9 is not the buffalo, so I will say 5. Okay, question answered. Ha, ha!
Am I so big a coin nerd that I was able to distinguish the difference? Sadly and proudly, the answer is yes. To me, Buffaloes always look slightly lighter in color, almost microporous like. I've always wondered if the depth of the design produced more heat to produce the Buffaloes giving them this look. Maybe I'm just crazy...