This heavy (3 ¾ lb) solid brass medallion commemorates the Sturgeon Class U. S Nuclear Attack Submarine, USS Whale – SSN 638. The Whale was launched on Oct.14, 1966 and commissioned on Oct. 12, 1968. She was decommissioned nearly 30 years later, in June, 1996 . Among her many training missions was her training above the Artic Circle. She reached the North Pole on 6 April 1969 and surfaced there in commemoration of the 60th anniversary of Rear Admiral Robert E. Peary's 1909 arrival there. This medallion is solid brass. It is 6 3/8 inches diameter and is 3/8 inch thick, weighing 3lb 10 oz.