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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.

    Gato Class Submarine
    Keel Laid February 21 1942 - Launched October 27 1942

  1. USS LAPON SS-260
    Commissioned January 23 1943 - Decommissioned July 25 1946
    Recommissioned April 13 1957 - Decommissioned August 10 1957

    Struck from Naval Register December 31 1975

  2. HNS POSEIDON Y-16 (Greek Naval Service)
    Loaned August 8 1957 to the Republic of Greece and renamed
    Decommissioned by Greece April 11 1975
    Sold April 1976 to the Republic of Greece for spare parts

    Sunk as target April 1976 in the Agean Sea

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 incarnation of the ship (ie, for each entry in the "Ship Name and Designation History" section). 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 Lapon SS-260 Covers Page 1     (1942-1943)



This section lists examples of the postmarks used by the ship. There should be a separate set of postmarks for each incarnation of the ship (ie, for each entry in the "Ship Name and Designation History" section). 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

Date From
Date To
Thumbnail Link To
Postmark Image
Thumbnail Link To
Cover Image

1st Commissioning January 23 1943 to July 25 1946


Locy Type
FDC 3z (BTT)



First Day in Commission, Passed by Naval Censor.


Other Information

USS LAPON earned the Navy Unit Commendation Ribbon, the Asiatic-Pacific Campaign Medal w/ 4 battle stars and the World War II Victory Medal during her Naval career.

NAMESAKE - A scorpion fish of the Pacific coast of America.



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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