There are a couple MS in each, Taylor and Jones records. I don't have them.
Here is a plain mold with MS one side TW on back.

Anderson Dam
Santa Clara County, ID
Used for gambling at the builders camp.

Morrison-Shea-Twaits-Winston joint venture (Morrison-Knudsen, J. F. Shea, Ford J. Twaits, and Winston Brothers) operations at Anderson Ranch Dam, Boise River (Year 1941 Project 33)

Government project with a camp and a general store. The initials on the chips are that of the 4 general contractors that were awarded the job and completed it.

Morrison went on to become Morrison Kneutson, a major world wide builder.