"Orders placed for the Silver Slipper, Las Vegas Nevada and showing the address as required by Nevada gaming regulations;
1957, 1961, 1964, 2 in 1965, 1966, 1967, 2 in 1968, 2 in 1969, 1970, 2 in 1971, and 1972."

I asked Jim for the molds on the above orders.
Here is his reply.
"H&C,Gem, Nevada, and HCE"
Please note, NO dice cards in those years.

Gem is what The Burt Co called the Greek Key.