Back vintages are wines that are not the current release. A retailer who has older wine in inventory may have purchased more than it was able to sell through before the new release came out. It may keep these back vintages indefinitely until they sell out (a great opportunity for you to try older wine!), but I wouldn’t expect to see something more than 5 years old kicking around.
I suggest: Napa Valley Cabernet Sauvignon, Willamette Valley Pinot Noir, Red Bordeaux, and Red Burgundy
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