Two Harvard University researchers announced Friday that they have found a second parchment manuscript copy of the Declaration of Independence in a tiny records office in southern England.

The only other parchment copy is maintained by the National Archives in Washington, D.C., researchers Emily Sneff and Danielle Allen said in a statement.

The newly discovered document — which the two have dated to the 1780s — was found in the town of Chichester archives, and is believed to have originally belonged to Duke of Richmond who was known as the “Radical Duke,’’ for the support he gave to Americans during the Revolutionary War, the researchers said.