1920
This is a metal caliper with a sliding scale. The head has pointed edges. The top section is fixed in place, while the lower section moves up and down the ruler. A small screw is present at the side of the lower section.
Unknown, 1865
Unknown, 1985
Unknown, 1900
Unknown, 1860
Unknown, 960
Unknown, 1899
Unknown, 1913
Unknown, 1850
Unknown, 1898
Unknown, 1910
Unknown, 1480