Defective playing cards.

In plural. Low-quality playing cards. Also Merry Andrew playing cards. Obsolete.

In plural. With capital initial. Playing cards of an inferior quality, sold in a wrapper depicting a Highlander (sense 1a). Now historical and rare.

plural Harrysor King Harrys: playing cards of the second quality.

A playing card stamped with an image of the Great Mogul, taken as a mark of superior quality. Obsolete.

U.S. slang. As a mass noun: marked playing cards.