Royal typewriter

I have this old typewriter that I'm having a really hard time trying to locate the model number on.

Its a Royal Citadelle(That's correct) typewriter. At a guess it was made somewhere between 1930-1950. It was my grandmothers who gave it to my mother before it was given to me. I think my grandmother bought it used but I can't be sure.

This was the very first machine I ever used to type with. I also typed my very first story, or tried to got to about 15 pages before I lost interest.

Decades ago I actually used this machine to make some coupons for school just to show my teacher I could do it, they were forgeries for free food from a canteen. I didn't use them but my teacher got the idea and came up with something a little less forgable. I mean really (this coupon entitles the student to free hotdog and chips from canteen) followed by his signature done on a white slip of paper. No logo and a very easy signature to trace too. They put a stamp with school logo in red on slip of paper after that.

ahh memories...

back to point.. anyone got an idea where to find a model number on this thing?