Ivan Permjakov directed the palace workshops attached to the Ober-egermeister's chancellery in St. Petersburg from 1755 to 1773. His son, Gavrila Permjakov, was also one of the best Russian 18th-century gunmakers
Cf. a silver-mounted Joseph Griffin gun (hallmarked 1770) with an almost identical side-plate in the W. Keith Neal Collection, described and illustrated in W. Keith Neal & D.H.L. Back, Great British Gunmakers 1740-1790, pp. 106-107, plates 360-363