Hi Tucker,
You have some personal monogram chips from the 1930's.
They are "Catalin" which is a brand name for this type
of celluloid, one of the early plastics. Besides chips
& chip holders, Catalin was used to make table-model radio
cabinets and jewelry, such as bangle bracelets & ear rings.
A full set of 200 chips or more in a catalin holder usually
sells for $200 to $400 if you can find the right buyer. Ebay
is a good place for it. List it under 1930's Catalin poker chips.
If you only have a few chips, they'll bring a buck each.