Plotting boards
When they cleaned out number one supply depot in Downsview, Ontario over 10 years ago there was a batch of plotting boards sold at auction. Some were in ww2 khaki bags and some in later olive drab bags. Unfortunately all the bags were marked with magic marker with unit markings. Also there was a wide range of dates on the rulers and other implements. So watch out for the desirable dates on the components.
There were tripods to support the boards (a fitting for the tripods is on the lower side) but I have never seen a correct tripod.
..... Brian
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