UPDATE II: I’ve added a second version of the W-O Canvas Top brochure (tan brochures). they come from a Willys-Overland Equipment Book that, based on other brochures contained in that book, was likely published earlier than the brochures that appeared in the original version of the post.
This jeep brochure from an early Willys-Overland Special Equipment catalog highlights the first production soft top for the CJ-2A. It was labeled a W-O Canvas Top. The material used wasn’t your average canvas, at least according to the brochure. Instead, it was 10oz soldenized duck. That description meant nothing to me, so I attempted to decipher it.
These two brochures were published in a Willys Industrial Equipment book. It appears Willys-Overland changed up the name slightly to the Willys Canvas Top, though in the text the W-O Canvas Top name remains the same as above.
The biggest mystery was the term “soldenized”. Not even the internet knows what “soldenized” means. The fact that the term probably describes a means of mildew or waterproofing makes sense, and Robert Ackerson described it similarly in his jeep book, but that’s more a description of the result of the process, not a description of the process itself.