[Diploma awarded to The Green Engine Company Limited / The Royal Aero Club of the United Kingdom. 1913 Feb 12. 1p., ms. signed. Awarded for the performance of a 60 H.P. vertical, 4 cylinder, water cooled engine which in 1911 won the Alexander prize of 1,000. (The aero engine is in the museum collection, inv. no. 1913-427] Diploma awarded to The Green Engine Company Limited / The Royal Aero Club of the United Kingdom 1913
Roberts's membership diploma of the Literary and Philosophical Society of Manchester ( 1823) by John Dalton as President Richard Roberts's membership diploma of the Literary and Philosophical Society of Manchester 1823