If the bottle has not been opened and no air has penetrated, then the content of whisky will still be in good condition. But DO NOT open it!!
In my opinion, your item could be worth a lot of money to a collector.
I have no idea what the initials F.V. on the bottom of the bottle relate to; it could be simply the initials of the bottle manufacturer. If this is the case, I cannot remember a bottle manufacturer with these initials and being a Scot who has always had an interest in Scotch Whisky and a long-term involvement in the industry, my immediate thoughts are that the bottle is very old indeed.
James Buchanan & Co Ltd., owned Glentauchers Distillery based in Mulben, Banffshire (in the Highland Region of Scotland), so that explains the origin.
Again, in my opinion, your bottle must date back to the early 1900 period and I would guess 1930-1950 (or earlier) and, if this is the case, you possess a very, very Rare item.
The Black & White 'see-through' green bottle was introduced probably around
1960 and, personally, I have never seen one similar to yours.
Albert; wrap it up in cotton wool and have it valued by a good Wines & Spiirt Auctioneer!! If I am correct, you could be worth a small fortune; if I'm wrong, you can always drink it!!
Would be interested in knowing the outcome.