Back in the late 1950s and '60s, some of us Yanks had Swedish Ericofon one-piece phones which were terribly, terribly modern. They were awkward to use with the dial on the bottom, but they still look retro-cool.
They were alone in having the build-in bill-reducing feature; your calls tended to be quite short -Those phones weigh a TON.
I've found an image of the first model we had when my parents first were talked around to actually having
Only, our brick walls were painted white...
Plus: I've found on-line prices for that model: 250 DKR (~45 USD) and the Ericofon Cobra (in the same gray): 600 DKR (~106 USD).