 The only known surviving Haden machines are 347 cc two-stroke cycle models.The Haden marque is not to be confused with the short-lived Hayden motorcycle, produced in 1904 only for F. Hayden of Cheltenham, by Kynochs of Birmingham.An archive of research and original papers about the manufacture of New Comet motorcycles is held by the Vintage Motorcycle Club in Burton-upon-Trent, where they are available for inspection.