Artillery M-17 or M-10 Plotting Boards - a rare find! U.S. G.I. Used by U.S. and foreign militaries for all artillery from Mortars to 8-inch Howitzers since at least WWII. Used to determine the "fan" for safe artillery shooting by the fire direction center. Use of the M-17 plotting boards is covered in FM-640 (not available) - Complete with case. A $100.00 collectors value.
Not guaranteed for accurate artillery fire. Please Note: Due to the limited availability of these plotting boards, there is currently no choice between M-17 or M-10.