Batch 23 is a 750ml version and bottled at 60.2%
According to Wikipedia, although it has no age statement, it is released in limited run batches, each batch carrying a unique number on its label. Each batch of this whisky is blended from barrels ranging from 5 to 25 years old.
A'bunadh is exclusively aged in Spanish oak Oloroso sherry butts and therefore has a sweeter, softer flavor than most scotch. At one time, sherry casks were universally used for maturing scotch whisky.
Rumour has it that when the second pair of stills were put in in 1975, a time capsule was discovered behind the name plate, containing an 1898 newspaper about the distillery fire wrapped around an 1898 bottle of Aberlour. The workmen who discovered the bottle polished off four fifths of it during their lunch break, but the remains of the bottle went off to the laboratories in Keith, and were analysed. A'bunadh is an attempt to recreate this single malt. A'bunadh is not chill filtered.
The word a'bunadh is roughly translated into English from Gaelic as "original."