The reciprocating group displaced 1010LT1030LT at standard load and 1305LT1325LT at deep load The ships measured 225feet long overall with a beam of 35feet. They had a draught of 12feet. The ships' complement consisted of 85 officers and ratings.
The reciprocating ships had two vertical triple-expansion steam engines, each driving one shaft, using steam provided by two Admiralty three-drum boilers. The engines produced a total of 2400ihp and gave a maximum speed of 16.5kn. They carried a maximum of 660LT of fuel oil that gave them a range of 5000nmi at .
The Algerine class was armed with a QF 4abbr=onNaNabbr=on Mk V anti-aircraft gun and four twin-gun mounts for Oerlikon 20 mm cannon. The latter guns were in short supply when the first ships were being completed and they often got a proportion of single mounts. By 1944, single-barrel Bofors 40 mm mounts began replacing the twin 20 mm mounts on a one for one basis. All of the ships were fitted for four throwers and two rails for depth charges.
Ossory was laid down by the Port Arthur Shipbuilding Co., Thunder Bay, Ontario, on 20 November 1943 and was launched on 3 October 1944. She was completed on 29 September 1945.
Ossory commissioned too late for service in World War II, joining the 4th Minesweeping Flotilla in January 1946 and serving in the Fishery Protection Squadron from 1946–1947. She was reduced to reserve at Portsmouth in 1948.
Ossory was scrapped at Troon, Scotland from 4 March 1959.
. Henry Trevor Lenton. British & Empire Warships of the Second World War. Naval Institute Press. Annapolis, Maryland. 1998. 1-55750-048-7.