The Big Eagle belt's reign only lasted from 1998-2002. Following the influx of WCW stars during the Invasion angle, the two company's belts were unified by Chris Jericho after defeating both Stone Cold Steve Austin and The Rock on the same night.
During Jericho's reign as the first-ever Undisputed WWF Champion, he carried both the WCW World Heavyweight Championship belt and the WWF Championship belt to the ring.
Following HHH's WrestleMania XVIII defeat of Jericho, Ric Flair and the Undertaker presented HHH with the Version 1 Undisputed WWF Championship belt in April 2002.
This belt would see a multitude of versions and sizes, but the overall design stayed similar. Following the brand separation, the Big Gold Belt was returned as Raw's belt, and the Undisputed Belt was now simply the WWE Championship belt.
This title design would be held by the likes of The Rock, Hollywood Hulk Hogan, The Undertaker, Kurt Angle, The Big Show, Eddie Guerrero, JBL, John Cena and Brock Lesnar.