No, sorry. I currently have a bottle open of this for my Knockdhu review and nowhere on the box or label states how many casks were in the marriage or how many bottles produced. I do know however it is partially bourbon and partially sherry matured. It is also interesting to note that Inver House does not state this one and its predecessor, the 1974 as a vintage, they refer to it simply as the 30Y old. In terms of quality it is outstanding, although it needs a fair amount of oxidation to open up. The price is incredible, 150€ for an official 30Y old... few distilleries offer this.
Since it states a vintage naturally it is limited by origine. That's probably where the "Limited Edition" stands for, I bet next year the 30Y old will be a 1976 vintage.