Three new covers have been added to the SSN 673 Ship's Post Office Archives in the Logroom. By covers, of course, we are refering to envelopes marked with cachets or postmarks related to the USS FLYING FISH, not hats. That will be a different post.
In the philatelic world, that of stamp collecting, a cover is a card or envelope that has traveled through the mail and contains postal markings. Collectors often prize first day covers, those postmarked on the first day of a stamp's release, or topical covers, those envelopes with a printed, stamped, or embossed design related to a specific topic.
There is even an organization, the Universal Ship Cancellation Society, dedicated to collecting cancellations and covers related to ships and submarines.
The USS FLYING FISH (SSN 673) has many commemorating such events as the launching, commissioning, decommissioning, and recycling. The boat also had, at several times, a rubber stamp that was applied to personal mail leaving through the ship's office.
Examples of both are featured in the LOGROOM >> ARCHIVES >> SHIP'S POST OFFICE.
You can find the images here: https://coldwarboats.org/logroom-673/ship-s-archives-673/ship-s-post-office-673 or
in the HISTORY & HERITAGE >> COLD WAR BOATS PHILATELY COLLECTION here: https://coldwarboats.org/homeport/history-heritage-fleet/collections/cold-war-boats-philately
You do not have to be registered or logged in to view the SSN 673 cover collections.