The mold is called "Roman Border", though many know it as "Weave".
See Robert Eisenstadt's informative Mold Designs listing & pics on his website.
This one is Mold #89 (MD-89) in his numbering system. The link is --

http://www.antiquegamblingchips.com/molddesign_other.htm

FYI, he has about 10 pages of mold illustrations that are worth a look.

Also, The Chip Rack has a list/description of molds in the front (Table 2) but not pics.