Am afraid there is no such thing as an "authentic" portrait in the past or is going to be in the future.

The bogus autograph is glued onto an authentic steel-engraved portrait of the subject.

Although an abundance of artwork involving Christopher Columbus exists, no authentic contemporary portrait has been found.

No authentic portrait of Störtebeker is known.

This highly original documentary is an authentic portrait of an advanced alcoholic on what could be his final run.

No authentic portrait of him exists; alleged likenesses on medals, etc., are spurious.

The ingredients don't add up to an authentic portrait.

The museum says that it is the only authentic portrait of Crazy Horse.

There are no known authentic portraits of the man.

There are no authentic portraits: A true man of mystery.