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>>In the 1880s, Boss favored the sidelock design of Thomas Perkes (No.19​68 of 1878).
The gun shown is a 12-b, non-ejector (APUN 330) that sold in 1886 for £49.<<

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[Linked Image from jpgbox.com]

Posted for a knowledgeable gentleman.

Serbus,

Raimey
rse