Bob and Norma Clark from Redlands, California, had celebrated their 48th anniversary in August.
However in November, when they applied for a copy of their marriage licence for Social Security purposes, clerks at San Mateo County's Hall of Records could not find any records of their wedding.
The couple, who had met in college, took their vows in a church to the south of San Francisco in August 1964, shortly after Mr Clark had served in the army during the Cuban Missile Crisis.
Bob Clark told Redlands Daily Facts: "They went back to the year 1956, but no record of our marriage could be found."
The church that the couple had married in still had a record of the original ceremony, and they recently made their marriage "legitimate" at the San Bernardino County Hall of Records.
The maid of honour - Norma Clark's sister Deanna Silvestri - and her brother Bill Thrall, who was a junior usher at the original wedding, served as witnesses at the second ceremony.
Mr Clark brought flowers for Norma, and traditionally kissed the bride to seal the deal.
"I got her a nice bouquet, and it was just a hoot", he said of the ceremony.
"There were about 35 people there, who were asking us why we were there. We told them that we've been married... and we brought along a book of all our pictures and showed them [off]."
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