Canadian 6yr Whisky is the original and flagship blend. Usually, whiskies are blended after aging in order to marry the flavors but in the case of this flagship brand, the blending is done unaged (still in its "moonshine" state) in order to properly mix the various malts. It experienced a slight re-branding celebrating the "1858" date and is is often referred to as the "original 1858 whisky."
Canadian Club is a brand of Canadian whisky using a blend of different grains... and you have gotta love their new tag line, "Damn right your dad drank it."
Hiram Walker founded Canadian club in 1858. Interestingly, it was originally produced in Detroit but, with prohibition looming, the distillery was relocated to Ontario. Over time, it has become the largest distillery in North America (located in Ontario, Canada) and a true grain-to-glass distillery on a large scale. There's a nice write-up at the Windsor Star about their efforts to source grain as locally as possible.