Gordon (Spirit of Islay) hit it spot on!
Maybe one of these days, Ardbeg/Glenmorangie/MH will give me access to bottle numbers for all of their limited editions.
Of the Vintages, only the 1965 and 1990 had the out turn reported, and these were also only distributed in one batch each.
The 1975, 1977 and 1978 were released in multiple batches over 3-4 calendar years each.
Also of note, the 1977 is the only one that mentions "Non-Chill Filtered" on the label, and I haven't confirmed whether or not the other bottles were NCF even though it wasn't on the label.
Here's the Vintage page if you want to check it out.Ardbeg Vintage Releases