"Hello Dario. My records show the new shorter rounded corner one bow 'Golde' sunroof began from chassis # 10 929 746 from 4th August 1955. So the two bow longer straight edges 'Golde' sunroof production [3 fold] ran to chassis # 10 929 745. I hope this helps.Please tell Will, I will send will the Beatles photos soon. I like his new car. Well done Dario - as great gift for your son.