I think audiences' preconceptions with accents (especially American audiences) is odd, when you think about it.
If anything is a period piece and set in any country other than the United States, they expect the actors to have (some form of) British accents. I don't know why that is. All those TV episodes of Masterpiece Theatre with bonnets and bustles probably had something to do with it.
But it can be in France, Germany, Japan, Timbuktu, or Sweden ... if it's a work in English, set in a period of at least 100 years ago, we want those accents!
I do remember people (even other actors I talked to) at the time, finding the noticeable American accents on all of the leads in the film version of "Amadeus" to be jarring. They thought they sounded so "ordinary," because they didn't trot out something British for that era ... even though the characters are Viennese, Austrian, Italian, German, etc.
"Jaws is the Citizen Kane of movies."
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