1930s or 1970s?

Well, 1970s, actually, but when I first laid eyes on them I did hope for a moment that just maybe... But no. Foam soles + vinyl insoles = 1970s. Those rounded toes and off-center lacing, though!

My grandmother, born in 1906, favored moc-toes:

but I think she would have loved these, with their sensible 1" wedge heels and old-fashioned laces.