Will, in case you and others did not know, there are 2 different art work sheets.
Yours is exacty what you are calling it, a "proof" sheet. If a casino agrees with it, they sign it and send it back.
The distributor then sends "Gaming Art."
Looks close to the same except for the box in the right corner. Casino executive responsible for chip approval then has to sign it, date it, print name and title and state what the chip in the art, will be used for.