No telling how many Astro Optical & Yamamoto Refractors SEARS sold in the 1960s & 1970s... The Model 6345 90mm Astro is the largest that I know of:
Sears Model 6345 (CN gregju) on A-Mart 201606 P01.jpg
I think the Royal-Hex rotary eyepiece holder, with it's color-coded slots + matching eyepieces is crazy cool (and I know crazy).
Gosh! That is a sexy scope. I am glad to be in possession of one. I guess that I'm crazy, too.