Clausen has made some impressive finds in his regular perusal of estate sales and auctions, but he says none compares to his discovery of a 14th century nautical map now listed for $7.5 million.

The rare 14th-century portolan chart is worth $7.5 million. Robert Gauthier / Los Angeles Times / Getty Images Last fall, Christie’s auctioned off a “highly unusual” nautical map as part of ...

Clausen has made some impressive finds in his regular perusal of estate sales and auctions, but he says none compares to his discovery of a 14th century nautical map now listed for $7.5 million.

Auctions A Nautical Chart Sold at Auction for $239,000 Is Revealed as the 4th Oldest of Its Kind and Is Now Tagged at $7.5 Million The map depicts the waterways of the Mediterranean and beyond.

The film explains how maps utilize symbols and colors to represent various geographical features and man-made structures. It discusses the importance of understanding these symbols for navigation ...