This is a compound monocular with side pillar, focusing screw and sub-stage mirror that fits into and flips up from a rectangular wooden chest that also holds extra lenses, slides and other accessories. The “NAIRNE INVT ET FECIT LONDON” inscription on the stage refers to Edward Nairne, a prolific optician and instrument maker who began in business around 1750, who introduced this type of chest microscope around 1760, and began trading as Nairne & Blunt in 1773.
Ref: Directions how to use the Compound Microscope, as Made and Sold by Edward Nairne, at the Golden Spectacles fronting the North-Gate of the Royal-Exchange, London.
Description and Use of the Compound Microscope, As made and sold by Edward Nairne, At No. 20 in Cornhill, Opposite the Royal Exchange, London.
D. J. Warner, “Edward Nairne: Scientist and Instrument Maker,” Rittenhouse 12 (1998): 65-93.