When Guimaraens Vintage Ports were first released in the 1930's they were made in the same years as the classic Fonseca Vintage Ports but blended from slightly less powerful components, much like the second wines of the Bordeaux châteaux.
Today Guimaraens Vintage Ports are made in years when the wines are more supple and early maturing and Fonseca in vintages producing bigger, more long lasting Ports.