The Gutenberg Bible (also known as the 42-line Bible, the Mazarin Bible or the B42) was the first major book printed in the Western world with a movable type printing press invented by Johannes Gutenberg in Mainz, Germany between 1454 – 55.
It is believed that a total of 180 copies of the Bible were produced, 135 on paper and 45 on vellum. As of 2009, 47 or 48 42-line Bibles are known to exist, but of these only 21 are complete. They are considered by many to be the most valuable books in the world. The price of a complete copy today is estimated at $25−35 million.
Sources: University of Texas