All bottles of J&B Rare contain the text "and to his late Royal Highness The Prince of Wales (1921-1936)" on the label alongside the other Royal warrants of appointment. I'm afraid this gives no indication as to the age of the bottle in question!
18th March 2013
1950's 1.75 liters brought back from japan and its more than 63 years old how much is it worth
15th March 2013
How much is this bottle worth
26th January 2013