Engraved 145 near tracing point, 16145 under radial arm and 11 under dial and next to fine adjustment.
The condition of the instrument itself is very good, the box is very slightly distressed. Swiss circa 1870.
Ticket Price £390. Email me here
See: British Patent Specification No. 2753 of 1855*
Verzeichniss der im Jahre 1855 fur das Koenigreich Bayern ertheilten Erfindungs-Patente.*
No.19 is a patent for a ‘polarplanimeter’ granted to Professor Jakob Amsler on 14 Marz 1856.
