I agree with Pete. Robert Eisenstadt's dates are sometimes estimates from my long ago article in the "Casino Chip & Token News." I would put the HHR mold as starting about 1965-1970. The HHL was used before 1970. There is no possible way that the HHR mold was used 1946-1951. By the way, the seller of these HHR D4C chips in the 1970's & 1980's was Bill Borland.