I got these old monogram chips recently. It looks like an "SLA" on one and a "J" or "TCM" on the other. The white chip is blank on both sides. Perhaps a new mold type for my collection. All the chips have the same design front and back. They appear to be dried out old rubber composite chips, A lot of little hairline cracking. Has anyone seen this type of chip before or possibly ID the monograms? Thanks for any help.