A late 18th-Century three-draw 1in. telescope by Osborne
A late 18th-Century three-draw 1in. telescope by Osborne

细节
A late 18th-Century three-draw 1in. telescope by Osborne
mahogany body-tube, shade slide with lens cap, dust slides, the back plate signed Osborne Day or Night London, extended length -- 35in. (90cm.)
See illustration