Found printed in black on round burnt orange component covering.
overall: 2 1/2 in x 5 1/2 in
This is a B155 module with a green board and a blue plastic extraction handle, attached by two rivets.The component side is marked with two inspection stamps: "Tested 001 A.M.T." and "Inspected 124". "HALF BINARY TO OCTYL DECODER B155 A" is printed on the solder side.