Thank you, Jim! Don't say that too often or I'll get a big head!
But before I accept my award, I want to make sure that this isn't just another type of Dutch model before I go guessing that it is a prototype or private purchase assemblage. I know of of least two Dutch patterns that have this type hilt. Before the m1790, there was a very similar model pictured in Neumann, #48S, however, it also has the traditional curved blade. The point being, perhaps there IS a straight bladed pattern I'm unfamiliar with? Infantry favored straight bladed hangers of this type, as did naval. So, if it can't be pinned down as that, I would stick to 'private purchase naval', possibly one of a small batch and rather uncommon. A great piece, either way...
Dutch sword experts, any thoughts???