On the net I found the photo after which this stamp is designed, on which is given that the submarine in the foreground is the HMAS AE 1, on the right the larger vessel is HMAS ENCOUNTER en behind the submarine is HMAS PARRAMATTA.
Built as a second class protected cruiser on the Devonport Dockyard, U.K. for the Royal Navy.
28 January 1901 laid down.
18 June 1902 launched as the HMS ENCOUNTER one of the Challenger class.
Displacement 5,880 tons standard, dim. 114.65 x 17.12 x 6.48m. (draught), length bpp. 108.20m.
Powered by a Keyham 4-cyl. triple expansion steam engine, 12,500 hp. Twin shafts, speed 21 knots.
Armament 11 – 6 inch, 9 – 12 pdr., 6 – 3 pdr. Guns, three machine guns and 2 – 18 inch torpedo tubes.
21 November 1905 commissioned.
HMAS ENCOUNTER was a second-class protected cruiser of the Challenger class operated by the Royal Navy (RN) and Royal Australian Navy (RAN). She was built by HM Dockyard Devonport and completed at the end of 1905.
ENCOUNTER spent the first six years of her career operating with the RN's Australia Squadron, before being transferred to the newly formed RAN. During World War I, the cruiser became the first ship of the RAN to fire in anger when she bombarded Toma Ridge. ENCOUNTER operated in the New Guinea, Fiji-Samoa, and Malaya areas until 1916, when she returned to Australian waters. The ship spent the rest of the war patrolling and escorting convoys around Australia and into the Indian Ocean. In 1919, ENCOUNTER was sent to evacuate the Administrator of the Northern Territory and his family following the Darwin Rebellion.
ENCOUNTER was paid off into reserve in 1920, but saw further use as a depot ship until being completely decommissioned in 1929. In 1932, the cruiser was scuttled off Sydney.
Challenger class cruiser
Challenger class vessels had a standard displacement of 5,880 tons, a length of 376 feet 1.75 inches (114.6493 m) overall and 355 feet (108 m) between perpendiculars, a beam of 56 feet 2.125 inches (17.12278 m), and a draught of 21.25 feet (6.48 m). The cruisers were propelled by a Keyham 4-cylinder triple expansion steam engine, which provided 12,500 horsepower to two propeller shafts, allowing her to reach speeds just over 21 knots (39 km/h; 24 mph). Her economical cruising speed was 10 knots (19 km/h; 12 mph), which allowed the ship to travel 5,436 nautical miles (10,067 km) before exhausting her 1,314 tons of coal. In British service, the ship's company stood at 450, but while operated by the RAN, this was reduced to 29 officers and 269 sailors.
As completed, the ship's armament consisted of eleven BL 6-inch Mk VII naval guns, nine QF 12-pounder 12 cwt naval guns, six 3-pounder guns, three machine guns, and two 18-inch (450-mm) torpedo tubes mounted broadside. By the 1920s, the 6-inch and 12-pounder guns had been reduced to three and four respectively, although a 12-pounder field gun was added to the ship's arsenal. A single QF 3-pounder Hotchkiss gun replaced the six 3-pounders, while the original three machine guns were supplanted by four Maxim guns and two Lewis guns.
ENCOUNTER was laid down for the RN by HM Dockyard at Devonport in Plymouth on 28 January 1901. The ship was launched on 18 June 1902, commissioned into the RN on 21 November 1905, and completed on 16 December 1905.
From April 1906 to June 1912, ENCOUNTER served as part of the RN Australia Squadron. On 1 July 1912, the ship was commissioned into the RAN on loan, for use until HMAS BRISBANE was completed.
Assigned to the Pacific Station during 1914–15, ENCOUNTER was part of the force which occupied German New Guinea. In the course of these operations she captured the steamer ZAMBEZI on 12 August and, on 14 September, bombarded Toma Ridge to support the Australian Military and Naval Expeditionary Force; this action made her the first RAN ship to fire in anger. She covered the landing at Madang on 24 September. While patrolling the Fiji-Samoa area she captured the German sailing vessel ELFRIEDE on 25 April 1915. The cruiser operated in the Malay Archipelago during 1915, but was recalled to Australian waters on 11 February 1916, as all other RAN ships had been deployed elsewhere.
In July 1916, during a visit by to an unnamed island off the coast of Western Australia, two bronze cannons were discovered by ENCOUNTER officers Commander C.W. Stevens and Surgeon Lieutenant W. Roberts. The latter described: approximately 25 paces from the water’s edge, we saw the two carronades protruding, through the sand 2/3rds of each being exposed so that they were easily lifted out. They were ... 6 feet apart and certainly had the appearance of leading marks ... a large number of the ship’s company landed and next day, shifted sand over practically the whole area for a considerable depth. The only other object found was a small portion of a brass bound chest. You can imagine the disappointment of the matelots who had visions of buried treasure
—Surgeon Commander Roberts, Letter from Surgeon Commander Roberts, 18 August 1933.
Since these guns were erroneously thought to be carronades, the place was named "Carronade Island".
On 12 January 1917, ENCOUNTER was ordered to New Zealand, where she met a convoy of Australian and New Zealand troopships. The cruiser remained with the convoy until a rendezvous point in the Indian Ocean, where responsibility was handed over to ships of the East Indies Station. In August, the cruiser assisted in the search for the missing merchantman SS METUNG; it was not known until 1918 that she had been a victim of the German raider WOLF. From December 1917 until April 1918, ENCOUNTER underwent refit in Sydney, then returned to Western Australia. The ship travelled between Fremantle and Sydney several times before the end of the war.
The cruiser's wartime activities were later recognised with the battle honour "Rabaul 1914".
In early 1919, ENCOUNTER was sent to Darwin to protect Administrator John Gilruth, following the Darwin Rebellion. Gilruth and his family boarded her on 20 February 1919 and were taken to Melbourne.
Decommissioning and fate.
ENCOUNTER paid off into reserve on 30 September 1920. She was assigned to the naval base at Garden Island as a depot ship in May 1923, and was renamed HMAS PENGUIN. The ship was decommissioned on 15 August 1929. She was scuttled on 14 September 1932 off Sydney. ENCOUNTER lies at a depth of around 74 metres (243 ft) and is dived regularly.
Australia 2014 70c sg?, scott? (She is the vessel on the right of the stamp, in the foreground is the submarine AE 1 and behind her the HMAS PARAMATTA.