from the wine dictionary

second label
A term used for winery- or château-produced wines that aren't the quality necessary to be bottled under the primary label. Such wines are generally made from grapes that are either from new vineyards or below top quality because of a substandard growing season. Although not usually as wonderful as primary-label wines, second-labels can be surprisingly good. Some examples of second labels in California include Liberty School from caymus vineyards and Hawk Crest from stag's leap wine cellars. Examples in bordeaux, where such wines are sometimes referred to as second wines, are Les Forts de Latour from château latour and Moulin-des-Carruades from château lafite-rothschild.

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Note added at 2003-01-29 19:48:44 (GMT)
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Un couple de rêve dans ce coffret, c’est le Château Branaire-Duluc-Ducru, une des plus belles expressions de l’équilibre des Saint-Julien, et Sarget de Gruaud Larose, un second vin aux tannins aimables.\"

If the answer were another wine, there would be no reason to say, un second vin in French. it would just say, Sarget de x, UN VIN aux tannins aimables...