Fairly recent vintage, guessing 70s onward. Probably sold through a myriad of drafting supply houses. Very serviceable tool, what I learned on in HS.
https://archive.org/details/internationaltoolcataloglibrary?and[]=Drafting&sin=&sort=-date
Less style than these from the late 30s
https://archive.org/details/DietzgenCatalog38A/page/n15/mode/2up