This replicated "cancelled stamp" looks authentic.

4-color process image of an LC-130 Hercules at the Geographic South Pole. Foreground shows the ceremonial South Pole with flags of the original treaty signatory nations.

Sticker has self-adhesive back with peel-away paper.

Sticker-Stamp measures 1-1/4" x 3-1/4" (Above image is actual size)