Draw-Tite trailer hitch info

[jmking9]

I pulled this off my 72 the other day. Does anyone have any info on these? I was just wondering if it was something that would have been installed when it was close to new? Or were these something that could have been put on any time. It used to be chrome, and it is stamped "72 Blazer" I was about to scrap it, but after looking at it more, I thought maybe I should keep it.
Anyway, does anyone know if this is something I should hang on to, or was I right the first time, it's just scrap.