The rare, attention-grabbing stamp found on the envelope of a Broward County absentee ballot has officially been declared a fake.

Two independent stamp organizations examined the Inverted Jenny stamp in person today. Representatives from both the Pennsylvania-based American Philatelic Society and the California-based Professional Stamp Experts agreed the Broward stamp was a copy of the actual World War I-era stamp.

The forged stamp has several differences from a real Inverted Jenny, including border perforations.