Thank you all for your willingness to help out, and for your responses.
Special thanks to StuM who interpreted my HIN for me in detail. Now that I know that what I read as a "one" is in fact an "eye", I can now also see the answer in the diagram a number of you provided labelled "a-story-of-a-number".
My HIN indeed refers to a Lagoon 400
, and I now know it is a 2010 model, which was launched in late 2009.