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THE FIRST "FRONTIER SIX SHOOTER" ETCHED BARREL .44-40 COLT SINGLE ACTION REVOLVERS WERE MADE ESPECIALLY FOR J.P. MOORE'S SONS.
“The first production runs of .44-40 caliber revolvers featured plain barrels without the familiar etched caliber panel....J.P. Moore’s Sons originated the idea of the etched panel as an aid to help their advertising..."
- "The Official Record of the Colt Single Action Army Revolver 1873-1895" by Wilkerson & Hoyt