Theodolite - Augustin Santi
This is a very old surveyors transit.
Augustin Santi was a scientific instrument maker and optician between 1830 to 1862 and was based in Marseille, France.
Check out the beautiful hand engraving on the compass and horizontal and vertical circles.
The Santi label is not attached to this instrument but I found it on the net and included the label in the slide show for interest.
Also see the Artificial Horizon by Santi in my collection