It's not a complete sheet.
http://apr08.hugginsandscott.com/cgi...pl?itemid=7410
The large one with 282 cards may be complete. It shows good side margins, but not much margin at the top or bottom. The designs repeat, but the right is two rows lower than the left.
It's possible that the cards were printed on a press that prints on a continuous roll of paper. (web fed) If that's the case, there would be no upper or lower margins although there's usually at least some gap where the plate begins and ends.
Steve B