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NavSource Online: Mine Warfare Vessel Photo Archive

MSO-485
ex-AM-485

Courtesy of Arie van Mazijk

Call sign:
Papa - Alpha - Juliet - Papa

AM-485 was built for the Netherlands

AM-480 Class Fleet Minesweeper:

Laid down 17 February 1952 as AM-485 by the Peterson Builders Inc., Sturgeon Bay, WI

Launched, 22 August 1953

Completed 22 November 1954 and transferred to the Netherlands and named HMNLS Onverdroten (M 889)

Reclassified by U. S. Navy as an Ocean Minesweeper, MSO-485, 7 February 1955

Reclassified by The Netherlands as A-859

Sold 18 September 1984 to W. Mantel of Amsterdam, Holland

Scrapped.

Specifications:

Displacement 750 t.

Length 171'

Beam 35'

Draft 10' 4"

Speed 15 kts.

Complement 39

Armament: One 40mm mount and two .50 cal. machine guns

Propulsion 1,600shp General Motors diesel enginess, two shafts.

Click on thumbnail for full size image	Size	Image Description	Source
AM-485
	55k	Minesweeper hulls AM-483, 484, 485 for the Netherlands in the background. In the foreground is the last American-made side-wheeler still afloat in the U.S. and used as a floating warehouse, Restored and now serves as a museum in Sandusky, Ohio Photo courtesy Peterson Builders	Mercuur Museum Website
Onverdroten (M 889)
	64k	30 April 1955 Ponta Delgada, Azores Brouwershaven (M 858), ex-MSC-150, Onvermoeid (M 887), ex-MSO-484) and Onverdroten in dress ship for Queen's Day still wearing their U.S. Navy hull numbers	Arie van Mazijk
	68k	Still wearing her U.S. Navy hull number
	76k	Still wearing her U.S. Navy hull number
	90k	Crew photo
	132k	c. 1955 Arriving in Den Helder, Holland
	212k	.
	38k	.
	54k	Royal Dutch Navy photo	Mercuur Museum Website
	123k	Oostende, Belgium	Mercuur Museum Website
	61k	Moored outboard of an unidentified English Frigate	Arie van Mazijk
	65k	.
	47k
	67k
	48k	1 February 1956 Den Helder, Holland Moored aft of Onvervaard (M 888), ex-MSO-482
	121k	c. 1957 Royal Netherlands Navy photo from the 1958/1959 edition of Jane's Fighting Ships	Robert Hurst
	212k	c. 1958 Oostende, Belgium	Gilbert Gyssels
	79k	c. 1964 Photo by Stefan Terzibaschitsch from the 1964/1965 edition of Jane's Fighting Ships	Robert Hurst
Onverdroten (A 859)
	44k	.	Arie van Mazijk
	47	.
	107k	Undated post card showing Onvermoeid (A 857), Onbevreesd (A 855) and Onverdroten laid up in the Reserve Fleet
Onverdroten
	8k	.	Tommy Trampp