Identity:
James Stewart Westmacott was a sculptor.
Life:
He may have known JW in the mid-seventies, when his name appears in an address book (#12714).
Bibliography:
Simpson's Chelsea ... Guide, London, 1863; Chelsea, Pimlico, Belgravia Directory, London, 1881, 1885, and 1886/1887; Kelly's Directory of Chelsea, Pimlico, Belgravia Directory 'Buff Book', London, 1887.