The coin "Reverse 1909 to 1958" is set wrong. Supposed to be exhibiting reverse on front side of holder. Point of set is the introduction of memorial reverse, compared to wheat reverse. No "other half" to this set as far as I can tell.
I would check eBay sold and see if this set has sold before. My opinion is $20 on a good day, more likely in the $9.00 to $19.99 range though. I would keep it and look for a nice 1909 cent to put in the holder to replace the 1958 - D (?) wheat cent. That would make a nice upgrade and make the set more interesting.