September 1932. Varna. Photos from the Museum of Varna.

Country: United Kingdom.
Class, [Type]: Rainbow, [SS].

Builder: Vickers, Barrow, United Kingdom.
Laid down date: 24 July 1929.
Launch date: 11 June 1930.
Commission date: 29 January 1931.
Decommission date: 30 July 1946.

Displacement ( tons ): 1790 surfaced, 2060 submerged.
Dimensions ( metres ): 87 x 9 x 5.
Main machinery: 2 x Admiralty diesel engines ( 4640 hp ), 2 x electric motors ( 1635 hp ).
Speed ( knots ): 17,5 surfaced, 8,6 submerged.
Complement: 53.

Guns: 1 x 1 120mm Mk IX.
Torpedoes: 8 x 1 533mm torpedo tubes ( 6 bow, 2 stern ).