Nice looking sword. I think your sword likely dates between 1821 and 1830. In 1821 regulations changed, now calling for straight blades on infantry and artillery officer swords. Swords from this era do display the blued single edge blade such as yours. By 1832, it seems many of the officer swords had langets added where the hilt meets the blade, so yours would appear to predate that. In addition, since I can see some of the original gilt present on the brass, I believe it was made for an artillery officer. Regulations called for artillery swords to be finished in gilt, infantry in silver.