Hi I have a bottle of

Grand Old Parr Specially
Selected Old
Scotch Whisky
Distilled & Blended in Scotland
Blended by Proprietors
MACDONALD GREENLEES LTD
DISTILLERS
Leith Scotland
Bottle under Commonwealth Supervision
Thomas Parr
Aged 152 years

I think its about 50 yrs old also ?
Where would I go to find out the value ?

If anyone can help I would appreciate it very much.

Thank you Wendy