En primeur refers to " purchase of wines by investors before the wine is even bottled."  {{   in chinese   " wine flower "  }}

The trade is mainly centred around Bordeaux wines of France.

Some of the  best Chateau  known  by me are :

Latour, Lafite Rothschild, Haut-Brion, Margaux, Mouton Rothschild, Petrus.  ....................  (names in random order)

For u r information , the cellaring charges for en primeur wines are about HK $200 per case per year.   normally you  may store 8 to 10 years.

Wine prices are not only affected by the vintage  and the Chateau, but also by wine critics.
One of the most influential wine critics is Robert Parker  who is Americian.

In 2006,    by aution at Sotheby ,  50 cases of   1982 Bordeaux      from First Growth Mouton was sold for US $ 1,051,600 ( HK$ 8.2 MILLION )    .