Apollo CM Block II Gyro Display Coupler manufactured by Honeywell, 20 x 6 x 6.5, with an affixed parts label reading, “Coupler Gyro Display, NAA/S & ID Control No. ME901-0707-0002, Mfr Serial No. 10028DAH1005, Mfr Part No. BG281G1, Contract No. M5J7XAZ-450012A, Mfr Date 14 Sept. 1966.” An additional modification tag is affixed below. The unit has a thick gray metal housing with two red-capped ports labeled “J1” and “J2.” Scattered marks, dings, and soiling, otherwise fine condition. Part of the Apollo Command Module Stabilization and Control System, the GDC provided the interface between body rate (roll/yaw/pitch) sensors and panel displays to give an accurate readout of spacecraft attitude relative to a given reference coordinate system. Oversized.
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