Unmarked Cast Iron and Brass Optical Bench, bench consisting of a boxwood scale marked 1-37, parallel brass rods holding the six sighting pieces with different aperture and magnifying diameters, each one attached to a sliding bridge with red-painted pointers, mounted to a turned wood column and resting on a cast iron circular base, lg. 15 1/2 in.
Unmarked Cast Iron and Brass Optical Bench, bench consisting of a boxwood scale marked 1-37, parallel brass rods holding the six sighting pieces with different aperture and magnifying diameters, each one attached to a sliding bridge with red-painted pointers, mounted to a turned wood column and resting on a cast iron circular base, lg. 15 1/2 in.
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