Your photo shows a bottle of tawny port, not vintage port. 40 years refers to the average length of time the blended wines have spent in barrels before bottling. Vintage port is only declared in exceptional years and develops a sediment in the bottle. Tawny port is lighter in colour because it loses colour owing to the time it has spent in the barrel. It can be drunk straight from the bottle as there is no sediment - but only by consenting adults in the privacy of their own home. If you have not yet drunk it, I suggest trying it with mince pies.
I believe the reason wine bottles evolved to a standard 70/75cl is that that was the typical lung capacity of an artisan glassblower.
Merry Christmas.
The stuff was 40 years old - doesn’t that make it vintage???
what the **** do I know, I’m from East Hull lol

