I just came across this thread, and the brief discussion about the lead in Christy Jones and Paul-Son chips. It reminded me of an article I read years ago by someone who looked inside the Christy & Jones
THC chips. Here;
http://www.ccgtcc-ccn.com/Superweights.pdf
Years ago, someone x-rayed a bunch of Christy & Jones
THC chips and found that all the Nevada casino chips with inlays had a small lead disk under the inlay, in the center of the chip. The few Christy & Jones
THC hot stamp chips he x-rayed did not have a lead disk, and none of the later Paul-Son chips with or without inlays.
This article makes me think that Burt Co. produced a standard chip without any weighted material. (People on this forum have noted that a lot of the old Burt Co. chips feel kind of light compared to modern Paulsons or CPCs.)
But I believe that at least some buyers back in the day could ask for their chips to be weighted with a lead disk. In fact, I suspect that there were possibly three different weights that Burt Co. offered; Unweighted, Weighted, and finally a “Tri-Heavy Weight” chip. (Below is a photo of a Burt manufactured B.C. Willis “Tri-Heavy Weight” sample chip on the Large Key mold. I haven’t had a chance to weigh it.)
At some point, the Burt Co. before 1988 (or possibly ASM after 1988), stopped using that whole system of using lead discs and replaced it with the mixing of brass dust/flakes into the clay composition. Paulson instead went with the more dangerous route of mixing lead into their clay mixture in the 1970s.
Does anyone know when Burt Co or ASM began to use brass flakes in their standard chip composition? Have some of you come across old Burt Co. chips from the 50s or 60s with brass flakes? Does anyone know when they stopped using lead discs?