I picked up a chip at the Dayton token show yesterday that is a lazy diamond mold hot stamped R&C. Looking though what I already had, I noticed the stamp is very similar to Rigdon Hourglass mold sample chips. I'm pretty sure this is a Rigdon sample too. I know there have been some Rigdon chips found with some X mold chips. I know White's distributed the X mold and the Lazy diamond. I have to believe, since White's and Rigdon both occupied the same building and Rigdon basically took over White's business, that Rigdon distributed the Lazy diamond and X mold too. The B&W ad below is from a 1959 Rigdon brochure.