I sent the seller a message which I think has been ignored.What that is is a Model 8 base with a Sheerline cowl,or possibly Sheerline engine.Without the engine number I don't know what the engine is off.He says it's a mark 3 utility there is no such thing.The first utility that was called a utility was the model 12.What that bit is about that 'I've been collecting for 15 years' has to do with it I have no idea.I think that is to try and install confidence into the mind of somebody who would be silly enough to part with $225 for a bitsa.Sorry but I just hate people who try to rip other people off with sales speeches with incorrect information.