Yeah definitely not the partner/pioneer model.
I have regretted selling all of those old Parts books, last batch I got for nothing, they were going to dumpster the books and some parts.
No this 450 is almost old enough to be an IEL. There was a model 400, 410, 450 ,NU17, and 550 that looked similar , they started out around 1958 and ran up til around 1968.