Hello, I too have a bottle of John Begg Gold Cap 26 2/3 Fluid Oz and 70 proof
It is still fully sealed, with all labels intact and it sits inside a black box with the distillers details and logo.
I guess it has only been out of the box a couple of times.
It has the number SC501.
Hoping someone can give me some idea of a value or where to sell it so that it reaches a collector.