Back in 81, I think, when they auction off Harrah"s Pony Express Museum these his and hers lighters were found in a desk that belong and was used by Bill Harrah . I got them from Allen Sax who was a big dealer in gaming items . It doesn't make much sense that the advertising is only seen when you fill the lighter but ?? Could have been salesman's samples ? Anyway don't think there are others around .