Circular Acco Helicoid gauge, serial no. Z71190, 5.75″ in diameter, made by the Acco Helicoid Gauge Company. Gauge is calibrated from 0 to 6000, has a NASA/KSC label affixed to the face, and a NASA KSC Cleaned label, dated March 10, 1985, affixed to the glass cover. The two calibration seals on the reverse are intact. In fine condition. RR Auction COA.
