A Sotheby’s auction, Arts of the Islamic World, scheduled for April 9th in London, features three antique game lots. [Click the images for larger views.]

A rock crystal king Chess piece from the Fatamid Caliphate in Egypt (11th century), estimated at £80,000-120,000 ($133,000-200,000):

Fatamid Crystal King Chess Piece

Another Fatamid rock crystal Chess piece, a knight, estimated at £40,000-60,000 ($67,000-100,000):

Fatamid Crystal Knight Chess Piece

A set of 15 ivory, stone, and bone game pieces from Persia or Egypt (9-11th century), estimated at £3,000-4,000 ($5,000-7,000):

Ivory Stone and Bone Persian or Egyptian Game Pieces