I'm on dial-up, so I can only see a couple of pictures. Near as I can tell, it's a MEC 650. You can download the manual from MEC's website.
First generation 650, you would want to add the later primer feed anyway.
The biggest knock on the 650 was (is) that it doesn't resize as a part of the normal reloading sequence. It will resize, providing the die hasn't been lost, but as a seperate operation. That seems to be a big issue for some folks, never was for me. I bought my first 650 in 1969, it's had more'n a few shells through it.
DC