Who was DON COLEMAN?

So who was Don Coleman? I've always wondered since my best friend sent me this card from her grandmother's collection. For years we've had a discussion about the brown crud up in the corner. What is it? We both agree it would be best if it were chocolate. 

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This is an old arcade card and from what I've found out about Don Coleman he was born in Sheridan, Wyoming January 14, 1893. He died in Willits, California on December 16, 1985. According to IMDB he appeared in 9 films from 1927 until 1930. I can't find anything else about him. Maybe someday a relative will google his name and this post will show up and they'll be kind enough to fill me in. I've always loved this rootin' tootin' card. I'd love to know more about Don.