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Clive Morely Harps, when queried about this action plate indicated it is likely to be a collector's item. It's a full action plate for a pedal harp made by Frederick Grosjean:
"Robsons London Directory 1822 Schwieso and Grosjean 11, Soho Square Pigots 1823-4 Schwieso , Grosjean and Co, ( inventor and manufacturer of the cambrian double and single action pedal harp with 2 rows of strings and double sounding board also of improved double and single action harps ) 11 Soho Square London Street Directory 1842 Grosjean, Frederick. "
Contact Catherine if you are interested in this item.