In the late 1970's I remember that part of Sand's was the main casino. However, was not old enough to go in and gamble, old enough to walk in and buy playing cards : )
When I lived in Reno in the early 1980's I used to eat at the Denny's that was attached to Mr. C's.... Wish I collected chips then : ) I do remember that they did use the narrow decks of Sand's playing cards on the BJ tables there.