This article is from the The Ghost and Mrs. Muir FAQ, by Caroline Kent caro@earthlink.net with numerous contributions by others.
November 13, 1869, according to the episode "Surprise Party." He was
supposedly 39 at the time, giving his birth in 1830, according to that
episode. I use the term "supposedly" because the show was rather
inconsistent in their use of dates, particularly in the second season.
This particular date, November 18, 1869, may or may not be accurate as
is the case with his date of birth.
 
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