The Brough Higher-class 981cc SS100 was one of two bought by Edinburgh police in April 1931.
At £180, it outlay more than the average salary but gave cops a speedy interest over offenders. Hitting speeds in excess of 100mph, it was one of the fastest carriers on the road.
The 87-year-old fully restored bike was in a private collection for sundry than 50 years before going under the hammer at Bonhams’ Bounce Stafford Sale, where it was valued at £170,000-£220,000.
The buyer, a private art-lover, wished to remain anonymous. Ben Walker, Bonhams’ global head of bikes, guessed: “We’re delighted this machine achieved such an impressive price. Entreats came in from across the world.
“At that time, the average car wish potter along at 30mph. You’d be terrified if you saw this machine coming up behind you with bells also bush – you’re not going to outrun it.”
Proceeds from the sale are going to three beneficences: RNLI, Search and Rescue Dogs and the Salvation Army.