I remember seeing (part of) this movie on American television in the early 1970s -- I saw it in black and white, but that may have been due to a B&W TV set rather than being filmed in B&W. Dialog was in English, not dubbed as far as I recall, and the modern potagonist had an eastern US accent.
In a prologue, set during the American revolution, two men were killed by, IIRC, a Redcoat firing squad and their bodies dumped down a cliche well (round brick casing, windlass for a bucket, small roof over the casing).
The movie then picks up in the "present day" (cars looked like 1960s or so, as I recall, but it's been nearly 50 years).
The modern protagonist is a teen (looks like 18-19), and there's a scene I recall in which he's in a bar in New York City and orders a beer; the bartender asks him his age and he responds "Forty-two," but his father comes into the bar and stops him before he can actually drink any.
I recall the movie as being at least partially comedic; the ghosts were rather slapstick, but I don't have any other details immediately at hand. I'd love to find this on Netflix or other streaming service, or YouTube, and watch all of it.