This artifact, a flight ready spare, was a critical part of the Saturn V guidance navigation and control computer system. The computer was housed in the Saturn V Instrument Unit, designed and built by IBM.
The computer and this board is of unusually light weight and was achieved by the use of magnesium-lithium alloy chassis, the first use of this alloy in structural fabrication for an electronics application and the lightest structural metal used in the aerospace industry.
The unit logic devices were produced as a wafers and a total of 8918 such wafers were mounted on dozens of pages in the computer. There is a green insulated connector that has gold pins. This artifact is labeled: 6111774 SERIAL NUMBER 3 and the back side reads: 6112680 35-2 B SIDE.