Absolutely rare bas relief copy in miniature of the DECLARATION OF INDEPENDENCE

Absolutely rare bas relief copy in miniature of the DECLARATION OF INDEPENDENCE with signatures and a vignette of the Signers at the center.  Done by S H Black in 1859.  Says at bottom "Entered according to Act of Congress in the year 1859 by S H Black in the Clerk's Office of the District Court of U S for Southern District of New York".  This Plaque or bas relief is executed in silver over brass with silvering almost completely intact.  Plaque measures 7 1/2 x 8 1/4 inches (complete with original gold frame measures 9 x 9 3/4.  An outstanding example of pre Civil War Americana. This is an original old item, not a reprint, copy or a restrike.