[Austin W Hogan]

The 0 to 6 number grading system that is stamped on most exposed hammer frames was formalized sometime after s/n 10000. The engraving and checking patterns of those grades remained in flux until hammerless production began.
TSP initiated the term "Dollar Grade" to describe grades of guns prior to the first Parker catalogs. These "Dollar Grades" are based on price lists issued in the 1870's. The $250 grade was the highest on most of these lists, and a $60 or $80 grade usually lowest, but surcharges were added for pistol gips and ten gauge guns. The lists began with two damascus barreled guns at $ 250 and 200, and twist or gun iron grades at less than $100. A middle $135 damascus grade was added along way. There was at least on "reduced price list" that had the $200 grade as the highest grade.
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Best, Austin