Hi! I noticed that your question remained unanswered and did not want you to feel ignored. I am not a baseball card officionado. But, I ran a seach for you to see if I could turn anything up. Eddie Plank cards would fetch a lot of money ( I saw one that was listed at $4,000) but those are from around 1909 or 1910. I am not sure about what you own.
I think it might be in your best interest to visit the following site, register, and post your question there. I suspect someone on that forum will be able to steer you in the right direction. Make sure you are as thorough as possible about the description of what you have. If you receive a number of offers to purchase, I would be leery of them. That would be a red flag to me that it is worth something and the prices you are being offered would be low balled from true collectors/sellers. They only buy things at a price that will guarantee them a major profit. You might want to consider listing it on e-bay with a reserve price listed at one of the higher offer these guys make:
Trading Card Central - Collector Zone | forums, message boards, blogs, chat
Good Luck!
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