Tiny book of psalms sells for £8.7m

The type's not easy to read, there's plenty of errors and it's on the scruffy side. Yet - Praise the Lord - this tiny psalm book has sold for £8.7m at a Sotheby's auction in New York. Only 11 copies are in existence. Its new owner is US private equity businessman and philanthropist David Rubenstein.

Why would such an inauspicious book be so valuable? %VIRTUAL-SkimlinksPromo%