Two (2) M161C modules with pale green board and a magenta plastic extraction handle attached by two rivets. The handle reads "digital " in raised letters on the solder-side. The board on the solder-side reads "M161C" along the left-edge. "FLIP CHIP" is printed between the rivets of the handle, component-side. Module 1 of 2 (with 539 B incised on solder side on handle): has two black inspection stamps on the component-side, one circle and one square. "SEP 4 1975" is printed OVER FLIP CHIP on the component side. A repeating "neLco" pattern is printed on the board in red. Module 2 of 2 (with 549 B incised on solder side on handle): has three black inspection stamps on the component-side; one circle, one square, and one triangle. "NOV 14 1975" is printed above FLIP CHIP on the component side. A repeating "Tc" pattern is printed on the board in red.