Pinwinnie 12yr olde

Hi everyone,
Need a little advice please,ive found while clearing out family belongings
a unopened still sealed old bottle of
Pinwinnie royale scotch whiskey xii years olde
says its a blended whisky hand bottled in airdrie lanarkshire
75%proof 26fl oz 75.7cl dark green bottle
its in a lovely purpke velvet bag and the box althought tattered is whole
label on the side of the box says inverhouse staff shop.
Any info on possible dates of this production and possible worth
would be very gratefull appreciated.

If required will post some photos tomorrow
Thanks in advance
Elaine