Gold Hologram Ken Griffey Jr. card misprint, same gold hologram picture on both sides!
Don't really know the value so taking offers. I've seen the regular card not misprinted for $127. On ebay
Again, let's see the rest of the slab. As you probably know the grade of a card will give wildly different values. If you want to sell, you need to give more information.
Here is the same card for under $10 shipped and it is dual sided as well. There are at least two different auctions currently on ebay for the same price. This guy has three available. Since yours is graded, yours may be valued differently depending on the grade.
The single sided can be had for $3.50.