My tasting notes for the Dow 1977 read as follows:
Completely oxidised; although this was once a Vintage Port, I think it would have easily passed muster as a Colheita. A very nice tawny colour, with a bit of fire. Perfectly drinkable for what it was. (Drunk: TPF offline 20v2009.)
Weak bottle. (Drunk: TPF tasting with Oscar Quevedo 11ii2010.)
Dark and complex with good fruit. Unfortunately slightly corked. (Drunk: TCP 20iv2010.)
Corked, again. (Drunk: Dow Tasting, 7ix2010)
There is obviously something very wrong with this wine. My failure rate is now, I believe, 4 out of 5 which makes drinking this Port a little too expensive for my taste, if one has to work through most of a case to find a good bottle!