A 6

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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.

    Adder Class Submarine Torpedo Boat
    Keel Laid December 13 1900 - Launched September 23 1902

    Commissioned September 19 1903 - Decommissioned April 21 1908
    Recommissioned November 20 1908

  2. USS A-6
    Renamed November 17 1911
    Decommissioned December 12 1919

  3. USS A-6 SS-7
    Designated SS-7 July 17 1920, While in reserve
    Authorized for use as target July 1921

    Struck from Naval Register January 16 1922

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. A-6 (ex Porpoise) Cover Page 1     (1906)



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 Image
Thumbnail Link
Cover Image


Flag Postmark

"Elmwood Station"

Providence RI


GregCiesielski Porpoise 19070709 1 Front.jpg
GregCiesielski Porpoise 19070709 1 Back.jpg

U. S. Submarine Boats "Porpoise and Shark", printed for the 1907 Jamestown Exposition. From the Tom Kean Collection.


Locy Type 1



JonBurdett hancock ap3 19110121 back.jpg
JonBurdett hancock ap3 19110121.jpg

Ship's postcard. U. S. Submarine Boats "Porpoise and Shark" in Winter Quarters, Brooklyn Navy Yard, N. Y.


Other Information

NAMESAKE - Any of several small gregarious toothed whales.



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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