Not 75%, not 80%, but exactly 77.7% drier, PROVED BY ACTUAL SCIENTIFIC LABORATORY SMOKING TESTS. Okie-dokie.
I have never heard of Hollycourt pipes aside from this old ad which I found somewhere on the internet, but here we have another gimmick pipe with some kind of aluminum doohicky incorporated into the stem that was supposed to prevent clogging(?!) and create a 77.7% drier smoke.
Unfortunately this graphic is kind of low-res and it's hard to read all the fine print, but you may also notice that these pipes were pre-smoked, and I'm pretty sure it says "by Linkman's Executive machine." So I suspect that this pipe was an offshoot of Dr. Grabow.