Insignia of the Royal Tank Corps A cap-badge and shoulder-title of the Heavy Machine Gun Corps; examples of cap and collar-badges (OSD and ORs') of the Tank Corps 1917 - 1924 by Gaunt, Firmin and other makers; arm-badges in worsted embroidery and metal; shoulder-titles and buttons; Royal Tank Corps pattern cap and collar-badges (OSD bronze and ORs' brass) of the 1924 and 1926 patterns in white metal. STs and buttons of the RTC, and a silver brooch hallmarked 1916. (49 items)