A full service instrument shop specializing in sales and service of marine compasses. Suppliers of genuine replacement parts for Danforth, Aquameter, Ritchie, Kelvin White, Dirigo and Star compasses
This picture is of the serial number log at E.S. Ritchie & Sons factory, it clearly indicates the serial number of this compass #1231. There is no entry beside the serial number which may mean that the compass was one of a group of compasses made for the previous entry.