Nice video.
Just to add on to Gmunny. The Burt Co. first made the GN mold. H. C. Edwards ordered the chips (for the GN) from Burt and would have hot stamped the chips that were not inlaid by Burt. On the Classic Poker Chips website, they have a short history of the company (which is descended from the Burt Co.), and it points out that they made the GN house mold and they take pride in the fact that it was the first casino house mold ever created. Their company history dates the GN mold to 1954. You can see the company history here;
http://www.pokerchipsonline.com/aboutus.htm
This is the timeline as far as I understand it. H. C. Edwards first ordered the chips from the Burt Co. for the Golden Nugget. Below are the order cards for the first 1954 order, and a later 1961 re-order, courtesy of the ChipGuide.
View attachment 1086967View attachment 1086970
View attachment 1086972(Courtesy of the ChipGuide)
From 1965 to 1973, Burt made more chips GN house mold chips, ordered now by Pat Sullivan and the Nevada Dice Co. Those order cards are on the ChipGuide too.
Mold cups are transferred (or duplicated) and T. R. King takes over manufacture in 1975. In 1975, however, T. R. King is forced to stop (or voluntarily withdraws as they might tell it) from selling denominated casino chips in Nevada. They continue to occasionally sell NCV and roulette chips, which do not need to be approved by Nevada Gaming Control. Paulson likely takes over production on the mold sometime around 1975, as there are no longer any Burt records of production on the mold.
By the way, as far as I understand T. R. King never had anything to do with the Square Square Rectangle mold. I know that the Eisenstadt website mentions that, but he is confusing the ZigZag mold with the Square Square Rectangle mold. They look slightly similar.
The Square Square Rectangle mold was exclusively owned by the Pacific Club Supply Co. in San Francisco, California, from around 1947 to 1955, when the company closed. It was then used by some other distributors, but always still manufactured by the Burt Co.