Only 10 BS4 (four cylinder) models were built and this was one of just three of the seven surviving models with its original engine.
The BS4 was the highlight of ‘The Broughs of Bodmin Moor’, eight bikes believed destroyed until Bonhams found them in 2015 in a barn in a Cornish village.
Discovered whole and in parts under decades of clutter, they were owned by the late Frank Vague, an avid member of the Brough Superior Club who formed the collection in the 1960s.
Bonhams’ Stafford sale on April 23-24 unveiled them for the first time in more than 50 years.
Described as the “motorcycle discovery of the decade”, the eight bikes achieved a combined £752,625.