Forget the gold, the scale starts with F and works up.
www.lcsmith.org/shotguns/1880grades.html
"The Smith hammer gun was available in either 10 or 12 gauge. The following were the Qualities offered in the 1884 catalog:
• Quality F – Best English stub twist barrels, American walnut stock, pistol grip, checkered and engraved, $55.
• Quality E – Good Damascus steel barrels, good American walnut stock, checkered and engraved, pistol grip, $70.
• Quality D – Fine Damascus steel barrels, good imported English walnut stock, nicely checkered and engraved, pistol grip, $95.
• Quality C – Fine Damascus steel barrels, fine imported English walnut stock, fine checkering and engraving, pistol grip, $125.
• Quality B – Extra fine Damascus steel barrels, finer imported English walnut stock, fine checkering and engraving, pistol grip, $150.
• Quality A – Very fine Damascus steel barrels, extra fine imported English walnut stock, extra fine checkering and engraving, pistol grip, $200.
• Quality AA – Finest Damascus steel barrels made, finest imported English walnut stock obtainable, finest checkering and engraving, complete in workmanship, pistol grip, $300."