Okay, it's got a straight metal 240 degree din plug, terminal layout with F13-24 sublegends, small feet, and the square badge. Through my method of lowballing every single Model M I don't have in my collection on eBay, I picked this thing up for a steal, but I have no idea what I'm looking at. I assume a standard soarer's converter will work, BUT I would like to know if you guys know when this was made, for what, if it's a 0th gen or 1st gen, what it was for, etc.
I've posted on deskthority and reddit, I'll update this with a part number if we decide on one so future googlers will find this info.