I’ve come across a company www.georgejackson.com who have been in business since 1780 and originally supplied Erard who was charged £66, apparently in 1811 (‘To 55 harps ornamentd compleat @ 24/-) with some of the compo decoration for the Grecian harps. George Jackson Ltd. still has the original sample board, photo below, and many of the original wooden moulds. Just wondered if anyone was aware of this resource?