Do mean the circular firing table for the Mortar for the Chosin Reservoir Display?
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I went through a lot of trouble finding it for the Museum. Someone stole the original one they had. I found a replacement for them. They put it on display the next day that I brought it in. One of the Docents was a Korean War Vet and commented on how bad the display looked with the Marine staring at nothing in his hands. He Thanked me for getting this one.