Expanding on what Manuel said, this type of blade is seen on a number of Swedish heavy cavalry swords from the 18th century (and a few cavalry swords from the early parts of said century as well). To provide some examples I'm attaching a close-up of an m/1773 (colour), and a scanned full-length shot of an m/1775 for Småland's cavalry regiment (b&w).
These two would have slightly shorter blades than Coleman's, but there are other, similar models with blades matching very well (m/1761 and m/1778 for Västgöta' cavalry regiment, and then of course there's the possibility of an officer custom-ordering something). I have pretty much no idea at all if, and then to what extent, this blade shape saw use outside of Sweden.
As for the overall package, it looks very much to me like assembled in the 19th century as a decorative.
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