Villa Oechsler

Located just a few miles inside the German border from Poland - and just a few hundred feet from the Baltic sea - this villa was built in 1883 by Berlin type foundry magnate Hermann Berthold.
 

The cartoons for the Bathing Graces mosaic on the gable above the sea-side portico were made by A. Bauer.

Sources:
Wikipedia DE
Barr, Sheldon. Venetian Glass Mosaics: 1860-1917. London: Antique Collectors' Club, 2008. 130.
Bill's Gallery on ipernity.com
Wikimedia Commons