I've recently seen 1970 vintage ports listed for anywhere between $60 USD and $180USD, depending on the bottler.
The vintage chart works on a scale of one to ten: the higher the number, the better the vintage.
The letters represent how the vintage has aged; some may need cellaring, while others may have already reached their peak. Vintage charts are subjective generalizations that assume perfect maturation conditions.
Vintages without marks produced no quality wine, were not shipped or, due to rarity, have never been tasted.
Port Vintage Chart Key
10= Sensational!
9= Very Fine
8= Above Average
7= Average
6= Below Average
Below 6= Beware!
HO = Hold, Slow to Mature
RS = Ready Soon
DW = Drinking Well
AS = Age Showing
ED = Early days (untasted)
NV = No vintage declared
2004
ED
2003
ED
2002
ED
2001
NV
2000
9 HO
1999
NV
1998
NV
1997
8 HO
1996
NV
1995
NV
1994
9 HO
1993
NV
1992
9 RS
1991
9 RS
1990
NV
1989
NV
1988
NV
1987
NV
1986
NV
1985
9 DW
1983
9 DW
1982
8 DW
1981
NV
1980
8 DW
1979
NV
1978
8 DW
1976
NV
1975
8 DW
1971
NV
1970
9 DW