I couldn't find any information on this maker's mark. It's a beautiful and intricate little spoon.
Marking on demitasse spoon - R with crown
Re: Marking on demitasse spoon - R with crown
Bumping. Hanau? Reusswig (?): https://www.925-1000.com/Fgerman_hanau_marks_01.html
Re: Marking on demitasse spoon - R with crown
And continue down to the unattributed section where there are more.