I need YOUR help!

So I was digging around in some of my cards today, and I came across this Topps American Heroes autograph of Col. Gordon R. Roberts. He is a decorated army guy, who has gotten one of the most respectable medals, the Medal of Honor. Only, this isn't what this post is about...I'm not going to get into all of the honorable things he has done, or how he got the medal. I have ONE simple question for you guys. How rare is this card, and about how much do you think it's worth? I have found NOTHING on this cards price, rarity, or print run. I was kind of bummed too, because I KNOW it's rare, I just don't know HOW rare. All I know about it is that is found 1 in every 303 packs, hobby.

 

Now, if any of you folks could help me out with this, it would be very much appreciated. You see, I got it at a consignment shop several years ago in Blackstone, Va. We were just walking the small streets of the town and I decided to walk in the shop. My eyes went straight to the three packages of cards sitting under a glass case behind the counter. I asked the man if I could take a look at the packages, as they had already been opened, and he let me go through the packs. I wanted to see if there was anything decent inside. Well the first pack I slipped the cards out and  saw autograph sticker. I immediately shoved it back into the wrapper and bought all three backs for 5 dollars...That's how I got it, but if any of you blogggers could help me out putting a price on this card, PLEASE let me know. I don't know anything about it, and haven't been able to find anything on Ebay, COMC or any other sites. Not even Google displayed any results for it. Thanks guys, I'm out!