Robert's notes are not entirely accurate.

The mold distributed by Jay Myers etc. (actually owned by John Huxley) is different to the one he mentions in the very next line. His picture on the main molds page is of the Hispania.

Now his picture here is misleading
http://www.antiquegamblingchips.com/mold/93_1.jpg

The chip on the right is the Huxley 39mm. The chip on the left is the Huxley 44mm shrunk down
I own both those molds btw.