SGR=Slot Glass Related. I bought a binder full(40+) of these 8 1/2"x11" templates for making slot machine glass. They were produced by
Suburban Graphics of Las Vegas. Most are on heavy vinyl sheet stock. Some generic and some with Casino names. Some have production numbers and "Master" printed in lower left corner. I'm not familiar with slot glass production, but suppose these were used at some point in the process. Something I had not seen before, but found very interesting. Will be at the BIG CONVENTION at my table. See you all there !!!
Doug in Kingman, Az. Please excuse the crappy scans. Thanks for viewing !!