John Coventry Micrometer Rulings
English, C.1800, unsigned, by John Coventry (1735 - 1812), first ruling on ivory 1.5cm x 7.6cm, second ruling on glass in a brass frame 1.6cm x 8.0cm
Sold for £312
Result plus buyers premium
English, C.1800, unsigned, by John Coventry (1735 - 1812), first ruling on ivory 1.5cm x 7.6cm, second ruling on glass in a brass frame 1.6cm x 8.0cm