I looked everywhere around here. This is a semi-fluid, self leveling grease.My friend/racing buddy/former boss, Josh Bertschy, owns Steerco Performance here in Fort Worth. He might not be as knowledgable about boxes that old, but he is pretty sharp on alot of the details and where to get things.
Apparently it is also used in lawnmower gear boxes in the Stens brand.
https://www.stens.com/770-123-00-grease
I went to every lawnmower shop within 20 miles, no luck.
I ordered some Champion grease from Eckler's. Should be here in a few days.
https://www.classicchevy.com/champion-00-manual-steering-box-grease.html