Engraving designed by A J Waudby (c 1866-1870?) and engraved by J H Le Keux. Figures engraved by C H Jeens. The certificate, which was isued by the Leighton Buzzard Branch of the Society, shows the Trade Union emblem with figures, inset with scenes of gauge work, bricklaying, brick making and asorted tools and props. Printed by Bradbury, Wilkinson & Co of Farringdon Road, London.
© Science Museum / Science & Society Picture Library