Use locks and keys. European basketball sets like the ones issued by Upper Deck in the 1990s fall in the minor issue category. Illinois collector and dealer Glenn Sidler has made a specialty of re- selling European hoop sets. Sidler warns collectors to be wary of the information printed in price guides. It isn't always correct.
Unusual items have an erratic history in the hobby, with some doing better than others.
A batch of oversize basketball cards appeared in the 1977-79 Sportscaster cards, a massive 2,184 card set featuring cards for some 150 different sports. These dimensions made them large, but by no means the largest, basketball cards. These huge cards featured top stars like Detroit Piston Isiah Thomas and Boston Celtic Larry Bird. The cards were premiums in an offer for a special album and an autograph pen. But the cards were not good sellers and could be found in clearance sales a year later for ten cents each.