Have Seen Nearly NOS Similar Units Offered For Less
And they still didn't sell.
Dexter, Philco and others offered those behemoth "twin" wringer washer systems and yes one could plow through mountains of wash quickly. Once you got a routine down pat it was faster than even using modern Hoover type twin tubs, and probably much more quiet as well.
That being said this particular seller is one sandwich short of a picnic basket on this one.
Three hundred might be the scrap value (if that), but for a unit that has electrical problems, would require a new grouded cord/plug anyway to meet modern safety standards, and a host of other issues such as those cracked wringer rolls they should be paying someone to haul it away.
Being as all this may it could make an interesting restoration project but shouldn't offer more than fifty USD.