This ten-card set of prototypes was issued singly as well as in a complete sheet. The cards were mailed out to prospective dealers and members of the media to show the unique new design of the inaugural SkyBox issue. The cards are distinguishable by the presence of a red diagonal "prototype" line cutting across the upper left corner of the front. The cards are standard size, 2 1/2" by 3 1/2" and are numbered on the back.
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