Many thanks for your response. The no. 9042: I know the nine refers to the model, ie. 30/90. but the 42 should indicate the 42nd boat built. However on your website the information indicates only 30 were built. Hence my enquiry
I usually don't add a number built unless I have some relatively reliable information. Which doesn't mean that It can't be wrong. And I can't tell you you WHERE that number came from.
If you have some better information indicating that it IS wrong, I would like to know about it.