Die-Cut proof sheet
 
 
There are several die-cut proof sheets like the one above. Some look a little more evolved in terms of printing quality and details, and have the numbers on the back (this one does not have numbers). Others look even less evolved than this one. These sheets are cool because they are first wacky packs ever printed.
 
 
 
 
 
 
 
 
 

Thanks to Jeff Weiss for this image