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As given by Malta Post leaflet:

MS WESTERDM is the third of Holland America Line’s Vista Class ships as well as being the third ship to bear the moniker WESTERDAM . It is a sister to the ms OOSTERDAM, ms ZUIDERDAM and the ms NOORDAM. The names of the four ships translate to the four directions of the compass in Dutch. The ship was christened on April 25, 2004 in Venice, Italy by Dutch actress Renée Soutendijk.

As with all Vista-class ships she is equipped with a diesel-electric power plant and an Azipod propulsion system, and eighty-five percent of her staterooms have ocean views and sixty-seven percent have verandas. The theme of her art collection is Dutch heritage in the New World. Paintings of historic Dutch ships, such as Henry Hudson’s HALF MOON, and various sculptures and statues are displayed throughout the ship. Contemporary pieces include an original Andy Warhol portrait and sculptures by Sedona artists Susanna Holt.
In April 2007, as part of Holland America Line’s “Signature of Excellence” program, modifications on the ship were done to add 34 staterooms, as well as modifications to several public areas of the ship.

Built as a cruise vessel under yard No 6077 by the Fincantiere Breda Marghere yard at Marghere, Italy for Holland America Line, Rotterdam.
Keel laid down?
19 July 2003 floated out under the name WESTERDAM one of the Vista class, she is the third ship by the HAL what carried the name WESTERDAM.
Tonnage 81.811 grt, 10.965 dwt., dim. 289.86 x 32.25 x 7.80m. (draught). Length bpp. 253.9m
Powered, combined diesel/gas turbine electric power arrangement, five Wärtsilä diesel engines, 51.840kW, who drive two 8.300kW and three 11.060 kW synchronous alternators, a pair of azipod 360º propulsion, speed 24 knots, maximum, cruise speed 22 knots. Three controllable pitch bow thrusters.
Bunker capacity 2.650 cubic meter heavy oil and 600m³ diesel oil.
11 Passengers decks with accommodation for 1848 passengers and 817 crew.
17 October 2003 when under fitting out, got on fire, but the fire was quickly extinguished.
15 April 1904 delivered to the HAL.

25 April 2004 christened by the Dutch actress Renee Stoutendijk at Venice.
Used for world wide cruises.
April 2007 was she modified and 34 staterooms were added, tonnage increased to 82.500 grt.

2009 As given by Equasis, IMO No 9226891, owner HAL Antillen N.V., Netherlands Antillen, and managed by Holland America Line Inc., Seattle, USA.

Malta 2008 1.40 Euro sg?, scott?

Source: http://en.wikipedia.org/wiki/MS_Westerdam http://www.faktaomfartyg.se/westerdam_2004.htm
http://www.miramarshipindex.org.nz

On 10 May 2011, while maneuvering through Yakutat Bay, south of Kluane National Park, British Columbia, WESTERDAM struck ice and incurred hull damage 15 feet (4.6 m) below the waterline.
On 28 June 2014, WESTERDAM suffered a boiler room fire after leaving the Port of Seattle. There were 2,086 passengers and 798 crew members on board, with no reported injuries. She returned to Seattle and was cleared the next day by the United States Coast Guard to return to the sea.
On 25 June 2015, a Promech Air de Havilland Canada DHC-3 Otter carrying a pilot and eight passengers from WESTERDAM on a Holland America Line sightseeing excursion over southeastern Alaska crashed into the face of a granite cliff near Ella Lake, 20 miles (32 km) northeast of Ketchikan, killing all nine people on board.

2019–20 coronavirus pandemic
In February 2020, the cruise ship, departing after a stop in Hong Kong on 1 February, was denied to call in the Philippines, Japan, and Guam over concerns regarding coronavirus SARS-CoV-2. After initially receiving approval on 10 February to let the passengers disembark in Thailand, as the ship was heading to Laem Chabang port near Bangkok, permission to dock was refused the next day. However, the ship was still maintaining its course to Bangkok and at around 10:30 am CET on 11 February, WESTERDAM sailed around the southern tip of Vietnam. According to Flip Knibbe, a Dutch passenger on the ship, all the passengers have had their temperatures checked a second time. Speaking to NOS on 11 February, Knibbe said "Dit schip is virusvrij": 'This ship is virus free'. Unlike the cruise ship DIAMOND PRINCESS, which is located in the port of Yokohama in Japan, those on board are not in quarantine. Everyone can move freely, shops and restaurants are open and the entertainment program continues.
On 13 February, the ship was allowed to dock in Sihanoukville, Cambodia. On 15 February, Malaysia reported that an 83-year-old US citizen who disembarked from WESTERDAM and flew into Malaysia on 14 February had tested positive for COVID-19. In a second test, requested both by the Holland America Line and Cambodian authorities, the woman tested positive again. Despite these findings, Cambodian Prime Minister Hun Sen visited the ship, discouraged the use of masks, and encouraged the passengers to tour the city, sparking concerns that another spoke was being added to the contagion network.
On 19 February, the last 233 passengers of the WESTERDAM cruise were cleared to disembark after all tests to determine the infection of COVID-19 in the 781 passengers of WESTERDAM gave negative results; the 747 crew members remain on board pending a final decision from the owner Holland America Line.
It is thought that about 650 of the guests on board the ship were from the US, 270 from Canada, 130 from the UK, 100 from the Netherlands, 50 from Germany, and several passengers from Australia. The crew consisted largely of Indonesians and Filipinos.

2023 IMO No 9226891, owner HAL Antillen N.V., Netherlands Antillen, and managed by Holland America Line Inc., Seattle, USA.
2023 In service.

Source Wikipedia.