The early packs issued in the 1960s have tight cellophane sleeves that shrink leading to buckling of the insert cards.

Pro Set introduced an insert card for Santa Claus that was labelled as a coach card.

"The kids are driven to find a valuable insert card, and they'll spend all the money they have to find it," Mr. Schaefer said.

Bowman Lithographs are larger versions of the Art inserts and were available as the prizes for the sweepstakes on the insert cards.

The first type are photo insert cards in which a hole has been cut in the center.

An assortment of the easier to find insert cards and not the rare 1:36 100% foil cards).

An insert card is a card that is randomly inserted into packs of a sports card offering.

Another term for insert cards is chase cards.

Insert cards either have their own numbering system (although some insert cards may have no number).

An autograph card is an insert card that is autographed by the player.