This is a great question. I had the same question when I wrote my book on casino silver tokens. I have the same design on a .999 silver $1.00 token from Terps.
It is a grain scale.
The Chip Board is maintained by David Spragg
Powered by Tetra-WebBBS 6.30.635.D / TetraBB PRO 0.40 © 2006-2012 tetrabb.com
0 wallclock secs ( 0.18 usr + 0.02 sys = 0.20 CPU)