A rare lacquered brass sphymograph signed Brevete S.G.D.G. and Breguet No.38867, with clockwork motor and brake in leather case signed J.Weiss & Son 62 Strand London and with plaque Presented to Mr. H.F.C. Harrison being the clinical prize given by Dr. Sibson to the Medical Society of St. Mary's Hospital - Session 1868-69 - 8½in Long