Hi Jonzi, this is the standard Ballantines 17 YO in a pottery jug. It's been produced in various colours and shapes for at least 40 years but this one dates from 1995 or later. There should be a red wax seal on the cork and the carton should contain a plug cork with a pottery top to match the colour of the jug. Although not rare there were never many made but they only go for the normal cost of a standard bottle of 17YO. If I was you I'd just drink it.