It is probably Ottoman, Arabian or other Islamic crown. Can you work out the symbol in the uppermost crescent? Do you have a view of the piece it is on? That will allow dating which would speed up the search.
Apart from Kingdoms there are caliphates and more. Each one tended to have their own crown, not handed down. So a good chance once you find the crown the letters possibly NH will match. Google images is one route but it will take a lot of searching. Possibly contacting Moser will prove a quicker route. Do let us know the outcome.