细节
A Col. W. Verner's Complete Sketcher
by J.H. Steward, No.659, with twin folding sights, depresion/elevation cursor and inset compass on boxwood base with various stamped scales to front and back -- 6in.(15cm.)wide, in leather pouch
by J.H. Steward, No.659, with twin folding sights, depresion/elevation cursor and inset compass on boxwood base with various stamped scales to front and back -- 6in.(15cm.)wide, in leather pouch