Printed in Korea in 1377, 78 years before Gutenberg, this is the world's oldest extant book printed with movable metal type. Known by its abbreviated name of "Jikji", only a single copy of one volume of the original 2 volume edition survives, and is held today by @laBnF in Paris. 
In a colophon the last page of Jikji is recorded details of its publication, indicating that it was published in the 3rd Year of King U (July 1377) by metal type at Heungdeok temple in Cheongju.
The cover on the surviving volume of this edition is a replacement of the original, and records in French "The oldest known Korean book printed with molded type, with 1377 as date". Jikji was donated to @laBnF by the heirs of the collector Henri Véver, when he died in 1950.
UNESCO confirmed Jikji as the world's oldest book printed with metal type in September 2001, and includes it in the Memory of the World Programme.
Jikji was purchased in Korea in the early 1900s by the French consul at the time, Victor Collin de Plancy. Most of the books Plancy collected in Korea were sold at auction in 1911, where Jikji was purchased for 180 fr. by Henri Véver. Vever later gave it to the BNF in his will.
Source gallica.bnf.fr / Bibliothèque nationale de France.
