Had that same model. Boy I sure loved using it. Gorgeous machine Hans. You're very lucky to have it. I need to come visit you and Donald sometime soon. And play with that Royal.
I had one when I was in high school and gave it away long before I knew I had something truely special. I regret giving it away... but regret far more WHO I gave it to. Big, big mistake.
I have a model 189 that is somewhat similar, except that the fan case, nozzle, and light hood are all separate parts. However, it does have the larger but more streamlined motor housing like your 259.
Jeff