I've been able to find 4 varieties of the older Sands Las Vegas feature matchbook with the penguins on the matches. There are 3 different outsides and 3 different insides (note the different slogans on the top of the hourglass). There are also two varieties of the penguins, one with half of them naked, and one with all but the last bird unclothed. All are Lion Features, of course.

I'd be interested in hearing if anyone has found another variety of this particular feature match.