Exceptional Langtons Classification. The Rockford wineworks and apparatus on Krondorf Road at Tanunda date back to the 1850s. The artisanal proprietors employ traditional techniques to assemble one of the nation's most singularly commanding wines. Parcels of the best dry grown old vine Shiraz, some of which were planted in the nineteenth century, from a select cabal of growers, operating vineyards in the Barossa, Kalimna and Ebenezer, Moppa Springs and the Eden Valley, are treated to an ancient basket press followed by vinfication in old fashioned open fermentation vessels.