B683 module with green substrate and a blue, plastic extraction handle attached by two rivets. Handle reads "DIGITAL EQUIPMENT CORPORATION MAYNARD, MASSACHUSETTS." A white, oval, paper sticker covers most of the above text. The sticker reads "MAR 79 9033984 CS." Reverse side of substrate (with solder joints) reads "50 OHM OR BUS DRIVER B683C" along the edge. Obverse side has several components and is marked with three inspection stamps; a circle, square, and triangle. All stamps are black. "FLIP CHIP" can be read through substrate, between rivets. A repeating "nelco" pattern in red print is visible on the substrate.