https://www.nytimes.com/2020/09/03/business/maine-mail-boat-covid.html
The Penobscot Bay Mailboat
Mostly about the islands, and island life, but plenty about the family serving this route (for 115 years) and a little about the boat(s).
And nothing, like, zero, about a postmark.
Cheers,
/s/ ikeyPikey
 
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