Are Treasury Wine shares a buy, now they are at 10-year lows?

Treasury Wine Estates Ltd (ASX: TWE) shares are experiencing a horrible year. Treasury Wine shares have been under constant pressure as investors digest softer sales and a procession of downgrades. The global wine share is trading at $5.65 apiece at the time of writing. That sees Treasury Wine shares down 49.9% over 12 months and at levels that remain at 10-year lows. Operational and macro headwinds The fall is painful for a prestigious company that is known for premium wine labels such as Penfolds, 19 Crimes and Lindeman’s, which are sold in more than 70 countries around the world. The…