Excelsior Wooler Flat Four Wooler Flat Four SPECIFICATIONS, PRICE & IMAGES Manufacturer: Wooler Model: Flat Four Engine: 500cc Year: 1955 Decade: 1950s Machine Type: Road Bike Features More Bike Specifications:Bridgestone GTR 350Motobi SportSpecial 250AJW SummitBrough Superior SS80Excelsior HendersonHenderson FourMotoTrans Ducati Vento 350Zundapp K 500