I would have to nominate the US Rubber Company and their line of enema and feminine hygiene equipment. I have both the original "Olympic" fountain syringe and it's counterpart, the "Olympic" water bottle. These have been replicated by copycats such as Klystra as well. There are copies in much larger sizes.
The "Olympic" line is embossed with ornate designs that are reminiscent of the time period. The black bakelite fittings are also oversized and are likely the Cadillac of enema and douche equipment of their vintage.
US Rubber also produced a line called the "Royal". I have a white Royal fountain syringe which is also a very beautiful piece from the early 1900's. The orangish red "Royal" water bottle is also very well constructed and somewhat oversized. These could be worthy additions to the HOF.
There are likely dozens of worthy nominees that date back for more than a century. As an equipment fetishist, and collector of such extraordinary items, I have been privileged to buy, sell, and treasure many of those vintage items. I'd be remiss if I failed to mention some of those items that were primarily marketed for feminine hygiene or douching. I have a pristine Rexall HyDaWay, Sojourn, and a wonderful replica of those vintage folding syringes that was produced and featured by Enemarotica.
I posted a few pics in the image section.
Thanks AnneMarie, for triggering some wonderful memories, and getting me sidetracked. I'm overdue for some shits and giggles with another of my best friends...Victoria...another worthy nominee from Rexall.