You're right, it is a very tough card that is very seldom seen. Your early Showboat card is a table players rating card for identification purposes .... not a slot card. There is no magnetic strip to track play electronically which is why this card is not seen often ... because the table player is not apt to leave it on the table when he/she leaves ... as is the case with "orphaned" cards left behind at slot machines. Extremely under-rated in the card catalogs ... probably because it is from A.C.