I am thinking this is and overdrive box, but I have read all overdrives were aluminum case. I am going to look at it tomorrow and I don't want to buy it if its overdrive.

PP8335072
Im guessing it was early 75' Is there any way to tell from this if it truly is a non OD? I plan on shifting into third and seeing if its one to one. That is the front fork correct? This is my first 833 so still new, any help is appreciated.