Comment by arrowsmith

See e.g. the conservative pundit William F. Buckley Jr, who spoke with a really classic example of this accent (and was alive much more recently than most people who spoke like this):

https://www.youtube.com/watch?v=p0d8mzdr4jE

It's such a weird mix of British and American locution. I've never heard anyone speak like this in real life, and they did I would look at them funny.