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Ship Name and Designation History

This section lists the names and designations that the ship had during its lifetime. The list is in chronological order.

    YMS-1 Class Auxiliary Motor Mine Sweeper
    Keel Laid 9 January 1944 - Launched 29 June 1944
    Completed 10 November 1944

  1. USS YMS-417
  2. Commissioned 11 November 1944

  4. Reclassified as a Motor Minesweeper (AMS) 17 February 1947 and named

  6. Converted to a Coastal Minesweeper, Underwater (AMCU) and reclassified 1 October 1954

  8. Reclassified as a Coastal Minehunter (MHC) 7 February 1955
    Decommissioned 2 April 1958

    Struck from the Naval Register 1 May 1959
    Sold for scrap 5 May 1960
    Sold again in 1960 to an unknown buyer in the UK
    Sold in 1971 to William F. Craig of Curtice, OH
    Converted to a yacht and renamed MISS JUANITA
    Fate unknown.


Naval Covers

This section lists active links to the pages displaying covers associated with the ship. There should be a separate set of pages for each name of the ship (for example, Bushnell AG-32 / Sumner AGS-5 are different names for the same ship so there should be one set of pages for Bushnell and one set for Sumner). Covers should be presented in chronological order (or as best as can be determined).

Since a ship may have many covers, they may be split among many pages so it doesn't take forever for the pages to load. Each page link should be accompanied by a date range for covers on that page.

  1. USS YMS-417 Covers Page 1     (1944)
  2. USS Merganser Covers Page 1    (DATE RANGE)



This section lists examples of the postmarks used by the ship. There should be a separate set of postmarks for each name and/or commissioning period. Within each set, the postmarks should be listed in order of their classification type. If more than one postmark has the same classification, then they should be further sorted by date of earliest known usage.

A postmark should not be included unless accompanied by a close-up image and/or an image of a cover showing that postmark. Date ranges MUST be based ONLY ON COVERS IN THE MUSEUM and are expected to change as more covers are added.
>>> If you have a better example for any of the postmarks, please feel free to replace the existing example.


Postmark Type
Killer Bar Text

Thumbnail Link
Postmark Or
Cover Image
Thumbnail Link
Cover Image
Or Back


USPO Slogan
Machine Postmark

Center Sta."

Cleveland, OH


Launching. Note: Back of cover has return address of E. L. Maag. Not sure what role, if any, they have in creating this cachet. Also notice that the cover was cancelled in Cleveland, Ohio - which is where Maag lived. Coincidence?


USPO Slogan
Machine Postmark
"Give The United Way"
San Diego, CA


The ship had no postal facilities.


Other Information

NAMESAKE - Mergus is the genus of the typical mergansers, fish-eating ducks in the subfamily Anatinae.

Three ships of the US Navy have borne the name MERGANSER - USS Merganser AM-135, USS Merganser AM-405 (Canceled 12 August 1945) and USS Merganser MHC-47.

The ships sponsor was Mrs. Bridget O'Daugherty



If you have images or information to add to this page, then either contact the Curator or edit this page yourself and add it. See Editing Ship Pages for detailed information on editing this page.


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