Henry Moore’s ‘missing’ sculpture Head on sale to the public for the first time

Not seen in public since 1952, the unique alabaster carving is expected to fetch up to £3m at auctionOver the centuries, painters and sculptors have exchanged works with one another, usually as a mark of mutual respect and friendship. Henry Moore and Ben Nicholson did just such a swap early in their careers and it proved to be an even deal between two of the most significant British artists of the last century.In 1931, Moore handed his close friend an exquisite sculpture of a girl’s