See under producer bottling.
Until the middle of the 20th century, it was common practice in many European countries for most wine producers (producers) to sell wine in barrels to merchants for economic reasons. These then often bottled the wine far outside the production area and also labelled it (in the sense of the wine law as bottler). This often led to unclean manipulation and wine adulteration.
One of the pioneers in favour of producer bottling was the young Baron Philippe de Rothschild (1902-1988). The Château Mouton-Rothschild red wine was first bottled entirely at the château in 1927. In accordance with an agreement, all Premier Crus then followed - although Château Margaux only followed much later in the 1950s. A wine labelled "producer's bottling"...
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Thorsten Rahn
Restaurantleiter, Sommelier, Weindozent und Autor; Dresden