All these tools, pencils, easer, and knife are WW2 period. The tools are scaled to 1:100,000, 1:50,000 and 1:25,000 which were standard G.S.G.S. British produced in scales for their ETO Maps. The pencils, eraser, and Knife are all WW2 period U.S.A. produced. The plastic and paper Ferrules on the pencils and the Blaisdell grease pencils were only produced during the war years. In fact only the Blaisdell Company produced these grease pencils that would have been used on the acetate grid of the map case. The correctly scaled Opisometer (Curvimeter) is either U.S. or British made, my guess in U.S. made.
Here is some historical reference from WW2 History of Army Map Service. It indicates the cooperation between the American Army Map service (AMS) and the British Geographical Section General Staff (G.S.G.S.): http://www.escape-maps.com/escape_maps/history_army_map_service_wwii.htm
Most of the maps used by British land and air forces in the Second World War were made by the Geographical Section, General Staff (GSGS, also known as MI 4), operating under the Director of Military Operations and Intelligence. GSGS senior staff were usually Royal Engineer officers with surveying qualifications, although there were a few Royal Artillery or infantry officers. The rest of the staff were civil technical assistants and clerks, together with some RE other ranks.
Also, specific areas of geographic responsibilities were divided between the United States and Great Britain. On May 12, 1942, it was agreed that the U.S. would assume responsibility for all map production and supply for: North and South America, Australia and New Zealand, the Pacific Islands, Dutch East Indies, Japan, Iceland, Greenland, and Bermuda. The Geographic Section of the UK General Staff assumed responsibility for all other geographic areas. It was also agreed the Army Map Service and the British Directorate of Military Surveys would share with each other all maps reproduced so each headquarters would hold world coverage. At an international conference on March 10, 1943, it was further decided that the U.S. would additionally be responsible for Korea, Mongolia, Manchuria, parts of Russia and Africa, and China north of 32°N and east of 108°E. The U.S. also agreed to accept responsibility to prepare several specific maps of parts of Western Europe.