Look at this
http://classicpokerchips.com/pokerchips/realclay/edgespots.htm
314 - three 1/4 inch edge spots
3D14 - three pairs of touching 1/4 inch edge spots (D denotes 'double')
Now look at the corresponding 1/8 inch and you will also see
3DS18 - three pairs of 1/8 inch separated by body color (D - double - for the pair, S for separated)
3DSA18 - same but with A for alternating color
The definitions on that page go way back to Burt Co. days.
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