Derwent Valley Water Board Railway mahogany cased Block Instrument with flag indicator and top mounted bell. Brass plated FOR TRAINS FROM DERWENT and FOR TRAINS TO DERWENT. Case stamped MRCo in various places and 1903. These instruments were provided by the Midland Rly for the Derwent Valley Water Board Railway between 1901 & 1903 it was used whilst the Reservoirs were being built. The reservoirs beacme famous as they were used by the Dam Busters to practice prior to the raids in Germany. In very good condition with slight damage to the case top left hand corner. A rare instrument unique to this line, stands 25in tall.