About a year ago I bought a box of uncirculated Reno Horseshoe bicentennial $5 casino chips. Today while looking at them more closely I found that one had the usual $5 inlay on one side but the other side had a $1 inlay. I checked and I don't see any error chip listed in the Chip Price Guide or new Chip Rack. Anyone have any idea as to rarity or value. Any help would be appreciated. Thanks.