Cased stage micrometer by Watson and Sons High Holborn London. divided in 100ths and 1000ths. Condition ok, noting small losses round slip.
Ask the Dealer
Fletcher Wallis sells objects and books relating to the history of science, medicine and technology from his unit at Admiral Vernon Arcade Portobello Road. He publishes books through Vernier Press, including Antique Medicine Chests, and Corkscrew Patents from 1795. He has been dealing for thirty five years.