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Traffolite
Chasps - Wikipedia say:
"Traffolyte was a brand name for multi-layered, plastic sheets suitable for engraving. Each layer was a different colour so engraved letters or shapes would be a different colour from the unengraved portions. Thus it could be used for name tags, labels and signs.
It has become a generic term. Sometimes spelt 'traffolite'."
Don't know why they call it plastic, because that was not a common term for it when engraving Traffolyte labels was king.
For Bakelite Wikipedia say:
"The name Bakelite was originally a brand, trademark name, but it is currently considered a generic term for all phenolic resin products, though some phenolic products besides Bakelite are brand-named."
The BT21 label looks to be a later plastic rendition, although thats only a guess, based on the fact that older bakelite tended to chip after many years once it had been engraved. Could be the real deal - easy to test.
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