DSC-RX100M3
ƒ/2.8
8.8 mm
1/60
125
Aluminum plate, anodized a striking red color, measures 23″ in diameter, and engraved with “Caution Step With Care,” and “Remove Before Flight,” as well as two lines of instructions near the top. Part numbers on pads on the reverse side have been evenly worn, probably from use.
While in Earth’s gravity, the crowded LM chamber needed a cover to protect the ascent engine valve assembly from engineers and inspectors.
Cover is signed in silver ink by Apollo astronauts James Lovell, Rusty Schweickart, Dave Scott, John Young, Buzz Aldrin, and Edgar Mitchell, each adding their missions under their signatures. Each of these six astronauts relied on the engines protected by this piece.
You can also see how little space there is between the engine at bottom and the LM overhead hatch. I have one of those on display on the same wall, 
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