United States. A USN Keel Laying Ceremony Gold Medal for Nuclear Submarine USS Baton Rouge

In 14k Gold, obverse has a naval trident through a gear wheel with the letters “N N” on the prongs. reverse is inscribed “ USS BATON ROUGE SSN 689 KEEL LAID NOVEMBER 18, 1972 NEWPORT NEWS SHIPBUILDING AUTHENTICATED BY MRS. F. EDWARD HEBERT”, measuring 32mm and weighing 15.06 grams, marked 14k on reverse, extremely fine. 

Footnote: USS Baton Rouge (SSN-689) was a Los Angeles-class nuclear-powered attack submarine which served with the United States Navy. With her keel laid down on 18 November 1972, Baton Rouge was launched on 26 April 1975. She became the second Los Angeles-class submarine to be commissioned, on 25 June 1977. In 1995, she was the first of her class to be decommissioned, after a collision with a Russian Sierra-class submarine.

At 20:16 local time on 11 February 1992, while on patrol off Kildin Island near Severomorsk, Baton Rouge collided with the Russian Sierra-class attack submarine K-276 Kostroma.[9] The United States Navy stated that the collision occurred more than 12 miles (22 km) from the shore, in international waters.[9] Initially the U.S. Navy denied any damage suffered by Baton Rouge, but it was later disclosed that the boat suffered two cuts, as well as dents and scrapes.[10] Kostroma was fully repaired by 29 June 1992 and continues in service to this day,[11] while Baton Rouge was removed from service soon afterward.