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The 1939 Brough Superior 982cc.
This clapped out motorbike might look like a total rust-bucket after spending more than 40 years rotting in a barn but incredibly it is still worth £15,000.
The tatty bike doesn't have any wheels or body styling, its exhaust has rusted off and its worn-out leather sprung saddle has seen better days.
Experts at Bonhams say is it will set enthusiasts' hearts racing because it is one of the most sought after motorcycles ever made.