That looks more like the artwork that Warwick posted on the Hard Rock Hotel website to me. Here's the link:

http://a692.g.akamai.net/7/692/985/01490ae169a0ab/www.hardrockhotel.com/shop/chiplist1/images/sammy_front.jpg

I'm guessing they changed the wording to "Mas Tequila" when the actual chips were printed. Anybody seen the "Suckers Walk..." wording???