I have seen a set near me (Taunton) advertised for around £5k for the set of gold/silver/bronze but they were unsold for a considerable time....
I would value a standard Gearbox at around £200-£250 so I find it difficult to see any more than £1k for these.
I would value a standard Gearbox at around £200-£250 so I find it difficult to see any more than £1k for these.