File:1955 Horex Imperator 400 twin cyclinder OHC right side.jpg - Wikimedia Commons
1953 Horex Regina 400 specifications and pictures
Parts & Specifications: HOREX REGINA 400 | Louis motorcycle clothing and technology
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Horex Regina 400 mit Seitenwagen, gesehen bei der Oldtimerausstellung in Uttrichshausen im Juli 2019 - Fahrzeugbilder.de
Horex Regina - Kradblatt
1953 Horex Regina 250 | Bike-urious
Horex Imperator 400 (1955-60) - motorcycle specifications
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Singular German: 1952 Horex Regina 350 - Motorcycle Classics | Exciting and evocative articles and photographs of the most brilliant, unusual and popular motorcycles ever made!
Horex Regina – Wikipedia
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Horex Regina 400
1955 Horex Regina For Sale in Norcross - Cycle Trader