I'm going to guess late 60s to mid 70s, based on the plastic tub and the square lid for the spinner.
It's also missing the "spin mat" that goes over the spinner to prevent socks etc. escaping whilst spinning.
Hey Launderess, I gotta question. Given that the drain pumps on these machines are often a weak spot, and sometimes the replacement pumps are sometimes less than perfect, couldn't one just use any decent washer pump with a built-in motor? Or for that matter use a pump with built-in motor from an industrial supplier? The point being to bypass the need to drive the replacement pump with a belt, by using a direct-drive pump.