US KOREAN WAR ERA? AIRFORCE ISSUE “INDICATOR ASSEM-COLD-CYLINDER, A.F. PART NO. 53D31539-TYPE A-1-A”, USED TO TEST TEMPERATURE IN ROTARY ENGINES

US 1950’S/60’S ERA “1ST ARMY” FOLDING ALUMINUM “SHOOTING STOOL”, BLUE DENIM AND ALUMINUM TUBE CONSTRUCTION, HAS “1ST ARMY” PATCH LOGO ON BOTH THE FRONT AND BACK PANNELS WITH “RIFLE TEAM” STENCILS, GOOD+/VG