1964, unfortunately. It gets tricky because there are a lot of different designations: whiskey is the main, then there are different sets, Irish, Scotch, Canadian, American, etc.. Then in America it breaks down into types: bourbon, rye, or whiskey (generic). After that it can be either straight, blended, or regular (so just bourbon whiskey, rye whiskey, or whiskey. Straight is not blended and has to be aged for longer). And you can add a region (I think only Tennessee and Kentucky, technically, but I could be wrong). So perhaps the information was just misleading or convoluted. It's confusing. I've done way, way too much research on this...
...anyhow, I'm supposed to be working. And we've used up like a page and a half of off-topic posts...