Overeem Sherry Cask Matured Cask Strength is a Tasmanian single malt from Old Hobart Distillery in Hobart, matured for a minimum of five years in 100-litre ex-Oloroso sherry casks — broken down from large-format sherry butts by a Tasmanian cooperage to maximise wood contact. Sherry cask maturation contributes dried fruit, walnut, spice, and a characteristic rich mahogany hue. This cask strength expression is bottled directly from the cask at natural strength — 60% ABV — without dilution or chill-filtration, delivering the maximum intensity of both the Tasmanian spirit and the sherry cask influence. It is Overeem's most powerful standard release and is suited to sipping with a small addition of water to open up the aromas.

Overeem Whisky is produced in Hobart, Tasmania — founded by Casey Overeem in 2005 as Old Hobart Distillery, with the first casks filled in 2007. Overeem was the fourth whisky distillery established in Tasmania and is considered one of the founding distilleries of Australian whisky. The distillery produces small-batch single malt whisky of around 8,000 bottles annually, drawing on Tasmanian barley and water and maturing spirit in a selection of port, sherry, bourbon, and PX casks. Casey Overeem sold the distillery in 2014; his daughter Jane subsequently bought back the Overeem brand and whisky stocks in 2020, re-establishing family ownership of the marque.