Similar to Pin Pics # 145 however This pin is an Artist's Proof from the Framed Set entitled "Walt Disney Atomic Age". The entire set consisted of 10 pins, which includes a large oversize main pin, a title pin, and 8 pins that were also part of the 1998 attraction series. All the pins in the Framed set are individually numbered XXX/750 while the pins from the 75 Artist's Proof Sets can be denoted by no number preceding the /750. All the outlining is silver. This pin is backstamped "Limited Edition" " /750" "©DISNEY"