BAP Almirante Grau (CLM-81) is a De Zeven Provinciën class cruiser in service with the Peruvian Navy. Completed for the Royal Netherlands Navy in 1953 as HNLMS De Ruyter, it was acquired by Peru in 1973. Since then, it has served as the fleet flagship of the Peruvian Navy. The Almirante Grau underwent a a major modernization program between 1985 and 1988 during which it was fitted with new weapons and electronics. It is currently the last gun cruiser in service in any navy.
The Almirante Grau was completed for the Royal Netherlands Navy in 1953 as HNLMS De Ruyter. After two decades in service, she was decommissioned in 1973, and in the same year the Peruvian Navy bought the ship as a counter to the acquisition of the Swedish cruiser Gota Lejon by the Chilean Navy. Renamed Almirante Grau, in honor of the Peruvian Admiral Miguel Grau, she arrived to its new homeport of Callao on July 11 1973. The Almirante Grau became fleet flagship replacing a former cruiser of the same name (the ex-HMS Newfoundland) which was renamed Capitán Quiñones.
From 1985 until 1988, she underwent a major modernization program by Amsterdam Naval Services (ANS) at its shipyard in Amsterdam, period during which she was denominated Proyecto de Modernización 01 (Modernization Project 01) or PM-01. Her role as flagship was assumed by her sistership Aguirre as Almirante Grau. Both ships regained their former names when the ex-De Ruyter reached Callao on February 15 1988.
The upgrade program carried out in the Netherlands included the following:
Further work was carried out by SIMA dockyards in Callao as follows:
Currently, the Almirante Grau is the last gun cruiser in service in any navy, (and Peru is one of only four nations to now operate any cruisers at all, along with the United States, Russia, and France).