Brass construction and measuring 14" when extended. Compound monocular configuration with objective ocular. Stage clips, sub-stage rack adjusted condenser with iris diaphragm. Plano-concave mirror. Rack & pinion coarse focus. In it's original mahogany case. Signed at the base "J SWIFT & SON, TOTTENHAM CT. RD., LONDON" Circa 1870. $1,250.00