133 bottles dating from 1892 to 1899 went on display at Bečov Castle in June after Château d'Yquem completed a meticulous restoration of the cache.
World War II likely drove the bottles underground: officials believe they were hidden beneath a chapel floor at the war's end and left there for decades.
1985 brought the discovery after an American businessman working for the Beaufort-Spontin family sought permission to recover a hidden object, prompting authorities to uncover the stash.
Cool, humid conditions in the chapel helped preserve the wine, and Château d'Yquem said the restoration was so careful that even the dust on the bottles was retained.
Bečov Castle, a nearly 700-year-old fortress near the German border, was confiscated after the war when its owners were labeled Nazi sympathizers.