Marianne Winkler, a retired post office worker, found the message from the past while on holiday with her husband on the North Sea island of Amrum.
Mrs Winkler found the bottle in April, but was shy of publicity and the full story has only now emerged.
"It's always a joy when some one finds a message-in-a-bottle on the beach," she told the Amrum News, a local website.
It turned out the bottle was one of 1,020 released into the North Sea between 1904 and 1906 by George Parker Bidder, a former president of the association.
Bidder released the bottles as part of a project to find out about deep sea currents.
The bottles were specially designed to float just above the sea bed, so they would be carried by the currents deep below the surface.