Dave, not seen that window ad either, presume Trev had a look at it? Pretty rare then I reckon.
US ad is a weird timeline modelwise, but then older unsold stuff was always sent overseas, what's with "manufacturers closeout?" not till 1979 / 80 by my reckoning? More likely importers?
Strange model selection too,I didn't know the Morris Royal Mail van was sold outside the UK, too British I would have thought? Maybe not.
My old man's Morris 1100 didn't look like that!
I'd take the lot on at them prices though!

CW