Picked these up at an estate sale today and looking to the experts. The blue chips I know are cheap plastic from the little injection mark, they are just slightly larger and weigh 6g. The hot stamped chips are what I am not sure about as they are tiny bit smaller but weigh in at 10g. Also, got container full of the house mold chips (multiple casinos) I figure they are not worth anything, but I like the mold and though some cheap labels would be neat to make. I cannot find any info on them; are these still being sold somewhere?