Down 47% in a year, are Treasury Wine shares finally on sale?

Treasury Wine Estates Ltd (ASX: TWE) shares are slipping today.

Shares in the S&P/ASX 200 Index (ASX: XJO) global wine company closed yesterday trading for $6.06. In early afternoon trade on Friday, shares are changing hands for $6.03 apiece, down 0.5%.

For some…