An unsual hardstone spinning fob seal locket, 19th century, the spinning fob seal set to one side

An unsual hardstone spinning fob seal locket, 19th century, the spinning fob seal set to one side with a bloodstone intaglio depicting the conjoined arms of the Paterson and Abercrombie families, the other with an agate intaglio with a monogram in Celtic lettering, opening to reveal a plain locket compartment, mounted in gold, length 2.1cm