WHAT DOES BUFFALO TRACE BOURBON MEAN?

I discovered a bottle on the 2005 EW Single Barrel at my community retailer blended in with the 2006’s. I remembered truly liking the only other bottle of EW Single I’d experienced and will’ve sworn it was an 05, so I snatched it up. Obtained household and recognized the a single I'd appreciated so much was an 04. Oh, nicely. My first assumed