This came from Dennis at TR King.
"TR King - 1st known records of actual chip production is 1936"
As others have said USPC made the Lcrowns up to a certain time. I would think the majority of USPC Lcrown production stopped around 1936 but special inlays might have been made after that.
TRK Trivia:
The TR stands for Teddy Roosevelt.
Teddy Roosevelt and the crown mold =TR KING
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