Dropped into the Atlantic Ocean's North Sea on June 10, 1914, this is the oldest message in a bottle ever found. A fellow plucked it from the sea last year. The bottle was part of a study of ocean currents conducted by the Glasgow School of Navigation nearly a century ago. From National Geographic:
"Oldest Message in Bottle"
According to (Marine Scotland Science's Bill) Turrell, Leaper's discovery -- plucked just 9 miles (15 kilometers) from where (Captain C. Hunter) Brown released it -- is the 315th bottle recovered from that experiment. Each one, Turrell explained, was "specially weighted to bob along the seabed," hopefully to be scooped up by a trawler or to eventually wash up on shore.
Turrell's Aberdeen-based government agency still keeps and updates Captain Brown's log. Oddly enough, the previous record—a message in a bottle dating to 1917—was set in 2006 by Mark Anderson, a friend of Leaper's who was sailing the same ship, the Copious. "It was an amazing coincidence," Leaper said in a statement. "It's like winning the lottery twice."
According to (Marine Scotland Science's Bill) Turrell, Leaper's discovery -- plucked just 9 miles (15 kilometers) from where (Captain C. Hunter) Brown released it -- is the 315th bottle recovered from that experiment. Each one, Turrell explained, was "specially weighted to bob along the seabed," hopefully to be scooped up by a trawler or to eventually wash up on shore.

I might just make a message in a bottle and date it, say, 2078, so if somebody finds it before then they’ll assume it was set adrift by a future time traveler.
I assume the Copious is a time travelling machine and will claim an even older bottle sooner or later.
It was found nine miles from where it was released, but had those old-fashioned stickers on it indicating it had been around the world 18 times.
And a warning not to break the chain. Mr. Wilber Jentsen of Muncie, Indiana, broke the chain and was run over by a streetcar the very next day.
Meanwhile a bottle I set adrift near St. Petersburg, Florida–because I thought it would be cool to see where it ended up–approximately three decades ago has apparently never been recovered, and probably sank to the bottom of the ocean.
Oh, that was yours? I found that in 1988. Do you want it back?
I’m a little concerned the fellow didn’t fill in the data as requested. This would be an even better story if it showed up in the mail room of the Glasgow School of Navigation filled out.
If they filled it out and dropped it off at the post office, we’d get a BoingBoing article out of it in 2109:
I want to set a bottle message in the Great Salt Lake but I doubt someone is going to march through 20 yards of brine shrimp corpse to retrieve it.