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I see your point, but they would have to keep ships logs, tax (customs) records, insurance details etc, which would, if preserved, give details of the available ships to carry the mail, and the number of stops each made at ports along the way. All this should clarify the dates and times the letter was in transit, especially if the voyages were infrequent or seasonal.
Permalink Sun, 11 Mar 2012 14:08:44 UTC | #926158