There was a bottling as shown in your pic of Glenfiddich and it was in an Edinburgh crystal decanter[you should check the bottom of the bottle for the etched Edinburgh name - its not always clear].
The stag head is pure silver to the best of my recollection. I used to have a colored picture from Edinburgh used as a sales brochure.
I 'thought' it was a 30 yr offering and perhaps there were two bottlings at 25 and 30 yr - not sure.
In any case, the 30 yr MSRP was - $3000!!
There was one on Ebay recently but I came in 2nd on the bidding.
These are fairly rare IMO.
There was a recent offering BUT it was listed under Edinburgh crystal so the scotch enthusiasts probably never saw it - it sold for $660[A STEAL] - I came in second in the bidding. The current listing on Ebay starts at $4000!