Ten real historic motorcycles shown with verified Wikimedia Commons photographs: Reitwagen, Hildebrand & Wolfmuller, FN Four, Pierce Four, Model J, BMW R32, Ner-A-Car, Megola, Majestic, and Vincent Black Shadow. Photograph credits: 1. File:Daimler Reitwagen.JPG; Wladyslaw; CC BY-SA 2.0 de; https://creativecommons.org/licenses/by-sa/2.0/de/deed.en; https://commons.wikimedia.org/wiki/File:Daimler_Reitwagen.JPG; 2. File:Hildebrand & Wolfmuller UMMC Museum.jpg; Stanislav Kozlovskiy; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Hildebrand_&_Wolfmuller_UMMC_Museum.jpg; 3. File:1905 FN Four Cylinder Petersen Automotive Museum.jpg; TaurusEmerald; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:1905_FN_Four_Cylinder_Petersen_Automotive_Museum.jpg; 4. File:1910PierceFour-Barber.jpg; DrReload; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:1910PierceFour-Barber.jpg; 5. File:Harley-Davidson Model J (1928) 989 ccm in NTM Prague.jpg; Addvisor; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Harley-Davidson_Model_J_(1928)_989_ccm_in_NTM_Prague.jpg; 6. File:1923 BMW R32 (1) - The Art of the Motorcycle - Memphis.jpg; Daniel Hartwig from New Haven, CT, USA; CC BY 2.0; https://creativecommons.org/licenses/by/2.0; https://commons.wikimedia.org/wiki/File:1923_BMW_R32_(1)_-_The_Art_of_the_Motorcycle_-_Memphis.jpg; 7. File:Ner-A-Car (1924).jpg; Addvisor; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Ner-A-Car_(1924).jpg; 8. File:1922 Megola Touring motorcycle side.jpg; Prova MO; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:1922_Megola_Touring_motorcycle_side.jpg; 9. File:Majestic 500cc 1930 noBG.jpg; Quelle: Thesupermat / Freisteller, Bildbearbeitung & Retusche von Auge=mit; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Majestic_500cc_1930_noBG.jpg; 10. File:Vincent Series C Black Shadow 1950.jpg; Piero at Dutch Wikipedia; CC BY-SA 3.0; http://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Vincent_Series_C_Black_Shadow_1950.jpg;