I have a model of this dinosaur, bought at the National History Museum when I was seven! But I thought his name was Plesiosaurus. I called the model Plesio.
Your model probably is a Plesiosaurus. ^_^ The Attenborosaurus is a genus of plesiosaur and was only named in 1993, and I think there is only one model of it in existence, which was only produced this year! Plesiosaurs are not dinosaurs, by the way, but are marine reptiles. ^_^
He looks very serene and happy, swimming along through his bubbles.