Breen-Gillio - Walter Breen and Ron Gillio, authors of the book California Pioneer Fraction Gold. They developed a rarity numbering system for California fraction gold coins.
Breen-Gillio Numbering system base on the book on California fraction gold coins by Walter Breen and Ron Gillio titled California Pioneer Fraction Gold.
BG Gold Term sometimes applied to California fractional gold coins as encompassed in the Breen-Gillio reference work titled California Pioneer Fraction Gold, including additional discoveries.
A late die state; the reverse is heavily shattered, a feature that does not show on the Breen-Gillio plate coin, and probably accounts for the rarity of the die pair.
 See also: Uncirculated, Dollar, Mirror, Coin, Half
  
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