For The Love Of Port

I have a bottle of Madeira i'd guess is probably 50+ years old.
It reads black label with white writing

MADEIRA
Funchal emblem
TITULAR

Adegas do (this bit is torn - id guess) Torrao(VINHOS)

Tax Selo Portugal 809532M - instiute do vinho do Madeira dec lei 75/79 dec reg 7/79m

Before i open it i'd love to know whats in it or indeed any information

Thanks in advance
Steve