This expression is part of the Vintage Reserve Collection. They've released a few others beforehand, including in 2014 the 30 Year Platinum release which was distilled in 1983, four years before John Teeling founded The Cooley Distillery and six years before it opened. So clearly Teeling acquired the barrel(s) for this expression. Given it was only 250 bottles, and the present 33yo is only 275 bottles, these might have just been one barrel each. At 500 bottles, this 30yo sounds like two barrels. I bet all four barrels, amongst others, were purchased at some point by John Teeling, their exact history would be fascinating!