Bowman Excel Speed Checks, Sample, made in the 1930s until 1940s, Chicago. A wealth of information & history is shared on chips & chip molds by collector Robert Eisenstadt on his great site here--> http://www.antiquegamblingchips.com/sitemap.htm
and the molds are here--> http://www.antiquegamblingchips.com/molddesignindex_site.htm Thank you for sharing the info Robert.