Located on reverse-side of substrate, upper-right corner
overall: 1/2 in x 2 1/2 in x 5 1/2 in
W520 module with green substrate and a tan, plastic extraction handle attached by two rivets. Handle reads "DIGITAL EQUIPMENT CORPORATION MAYNARD, MASSACHUSETTS." Reverse side of substrate (with solder joints) reads "COMPARATOR W520B" along the edge. Obverse side imprinted with a repeating red "nelco" pattern, has several components, and is marked with two inspection stamps; one is barely visible. "FLIP CHIP" can be read through substrate, between rivets.