Brass Plate 'AM Contract No A 82653 AM Ser No. 203 Year Of Supply 1952 Makers R. Hudson Makers No. 90698'. This company certainly manufactured narrow gauge coaches etc so this is most likely from a 2' Gauge wagon or other rolling stock. The 'AM' almost certainly Air Ministry so most likely in use at a Military Armament Depot such as Chilmark, Dinton, Fauld or Harpur Hill.