English Brass Sector, Signed “r. Glynne Fecit”, 18th Century (circa 1750–1775)

18th-Century English Brass Sector, Signed “R. Glynne Fecit”, c. 1750–1775
Length (closed): 16 cm — Width: 3.8 cm — Material: Solid brass

A fine mid-18th-century English brass sector, clearly signed “R. Glynne Fecit”, indicating manufacture by the little-documented instrument-maker R. Glynne, active in London during the mid-1700s.

The instrument is entirely constructed in brass, with crisply engraved proportional scales including Sine, Tangent, Secant, Line, Chord, and various diagonal scales typical of English military and mathematical practice. Both arms retain their original engraved markings, which remain fully legible despite age. The sector opens and closes properly, with the characteristic decorated circular hinge typical of 18th-century English work.

Sectors of this period signed by minor makers such as Glynne are comparatively scarce, as most known examples originate from the large London workshops of Adams, Dollond, Watkins or Heath. This example represents a fine and authentic working instrument from the Georgian era, suitable for collectors of scientific instruments, navigation tools, artillery history, or early mathematical devices.

Condition: Good antique condition with expected age-related patina and spotting; engraving remains clear and readable. Mechanically intact.

A desirable and increasingly uncommon signed brass sector from mid-18th-century London.