It is a later top action hammer gun with Parker Joseph Whitworth compressed fluid steel barrels. It was ordered by Dupont and came from the Dupont estate. The Whitworth process of producing compressed fluid steel in order to void the steel of air bubbles and impurity pockets was one of the first, if not the first, to reliably produce barrel blanks from fluid steel in distinction to castings. With the coming of the compressed fluid steel process, damascus barrel making declined, as damascus barrel manufacture depended greatly upon the skill of the barrel maker and was manpower intensive.
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