细节
COTTAM & HALLEN, London
A mahogany sighting device, with bubble-level, one (of two)folding sights and brass semi-circle divided 12-0-12 and inscribed Inches Fall in 3 Feet and Inches Rise in 3 Feet, signed Cottam & Hallen, Winsley Street, London -- 55½in.(141cm.)high, early 19th century
A mahogany sighting device, with bubble-level, one (of two)folding sights and brass semi-circle divided 12-0-12 and inscribed Inches Fall in 3 Feet and Inches Rise in 3 Feet, signed Cottam & Hallen, Winsley Street, London -- 55½in.(141cm.)high, early 19th century