BV1 (Boss, H&H, Purdey, and Woodward) = 4/4, BV2 (Westley Ricahrds, Dickson, Rigby, Grant , Beesley, Powell, Atkin, Churchill, Henry, Lancaster, Evans, Watson, Wilks, Greener, Boswell, Gibbs, and Lang) = 3/4, and BV3 (all other Brit maker names) = 2/4. That is to say that a W&S Propritarity model with Woodward's name on it will sell for a third more than with a BV2 name and twice what a BV3 name will fetch. Sorry, Jm, it just is not 80%!