In fact, the Late Bottled Vintage name originated because the grapes first used with the designation were ones intended for use in Vintage port, but left in the barrel longer than the maximum 2-1/2 years, for whatever reason. In other words, these weren't 'bad' or 'failed' grapes, just unused ones.
Today, shippers use the additional barrel aging to provide some of the experience of drinking a Vintage port without the long years of wait for bottle aging. It succeeds, to a limited extent, because they do use good grapes.



