As Rick, Jasper, Robert, Marcus and others have already said, you have a great sword there! It is an infantry hanger from roughly the 1750-80 period. It once had a shell guard, now broke off (extremely common among these.) I have one very similar, from an earlier period with shorter 'hanger' blade (the longer types favored by naval and infantry officers). My hanger likewise inscribed by a Dutch sword maker. I'll try and attach the thread. Yours looks like it has some active rust, so you might consider a very conservative cleaning with steel wool and olive oil. For similar examples, see Nuemann's 'Swords and Blades of the American Revolution',plate 64s.
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