The hose and PN are from the D4C SE PE model, the last version of the D4 before the E Series came out, this one would have originally had the rectangular P/N, with the metallic swirly decals under brown tinted clear plastic on the back and woodgrain on the front. The hose would have been non-electric with a cord strapped on the outside, and the D3 models had a cord that ran up the wand and plugged into the cord on the hose, unlike the D4 that had one long cord that came out of the PN and ran to the canister. The PN you have is I think a much better performer however.