Our neighbors had that set in H.G.  But, this Poppy set is even more rare.

"I wish these had is the viewing window"

I bet that wouldn't be too dificult to do.  Get a round piece of safety glass, some rubber gasket, a jig saw with metal blade, and carefully cut a hole, centered, in the lid.  It doesn't need to be water tight, or even air tight. 

In fact, a top loading washer lid window, for any brand,  has got to be one of the easiest thing to install.