Thank you for your information about the prints.
How things have changed three old pence in stamps got you a mounted colour print and you didn't even have to buy a bottle of whisky!!!
Your copy of an advertisement puts the Great Danes print at March 1930, (one down five to go) will have to try and find the others from other advertisement's from those years.
1929 to 1933 make's them at least 79 years old which answer's my question so thank you again Walter and Whisky.com
PS How much would three old pence be worth now?