This seems to be product 06194. I can’t find it on their web site, though I find related products with nearby numbers; I suspect it’s been discontinued.
This is an oversize side-bound spiral notebook. The pages are micro-perforated but not three-hole punched. The paper is “ivory”, and called “heavyweight”; it might be 20 pound, certainly no heavier. It also has two “pocket” pages.
The backing board of this notebook is much thicker, and much stiffer, than any of the others had. It’s very nice to use. This is the best of the notebooks I’ve found, though as I recall it was rather expensive (though not at the level of the $30 to $150 lab notebooks).