WW2 AUSTRALIAN ISSUED ARTILLERY PLOTTER NO 1
This is the rarest of WW2 Australian Army Artillery Plotting instruments. Issued in scarce numbers during WW2 there is non for sale in Australia and the only example I could find on the net is one in the Powerhouse Museum.
Its a technical piece of equipment as shown in the images. there is a steel label to one end that shows its a Plotter Artillery No 1, dated 1942 and Broad Arrow marked. It was made by the WIBROC Mfg Co Sydney NSW who made instruments at the time.