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In 1973, Penfolds crafted an experimental Bin 170 sourced entirely from the nineteenth-century Kalimna Vineyard in the Barossa Valley. 100% Shiraz, all of the grapes were picked from Block 3C – a venerated parcel that is often included in the Grange blend. In 2010, the Penfolds winemakers kept Block 3C separate, realising they had the potential to re-create a Penfolds classic.