In case some of you missed my post below, I'll repeat my offer here.
In a thread below ( http://www.thechipboard.com/index.cgi/md/read/id/1144632/sbj/uspc-id-of-the-day/ ), Gene Trimble discusses the ID of a new-found chip that is listed in the Herz USPC Co. Guide for vintage chips made by the US Playing Card Co. The TO/OT chip is listed as made in 1919, but there is no ID for the organization that ordered it (only a Minnesota cigar store middleman). It looks like the TO or OT on the chips is the logo of "ΘΤ (Theta Tau) Fraternity, which was founded in 1904 by four engineering students at the University of Minnesota in Minneapolis. Today, Theta Tau is the oldest and largest professional engineering fraternity in the United States, with a diverse membership of men and women studying engineering at more than 40 campuses."
By coincidence I just got the "TO" (or OT) chips in the mail Saturday, along with the white, triangle mold "UN" UFC chips -- both in the same package, both pictured below.
Here is the logo of the engineering fraternity. Notice the OT and the wavy dash:
William Boyd as Hopalong Cassidy in "Borderland" (1937).