The picture shows a view of this Old United States Navy New London Naval Submarine Base Advertising Ceramic or Porcelain Coffee Cup. The mug is not dated and the year that it was made is unknown. The mug pictures an insignia or emblem with a submarine and dolphins. It is marked as follows:
NAVAL SUBMARINE BASE NEW LONDON, CONN.
The mug measures 3-5/16'' tall. It appears to be in mint unused condition as pictured.