WOW, I CAN'T BELIEVE THEY HAVE THE DISHWASHER!!!
If I remember correctly this was the spin-tube design. Did this one have the all-porcelain front panels like the '56 did?
However, bargain with them if you want the pair...chances are they don't know the value, and whatever you do, don't say ANYTHING about it being a collectible. Antique stores are notorious for their outrageous prices from my experiences.
--Austin