Depends on the overall condition of the sword and, to a lesser degree, its date. From the two pictures you posted the parts shown seem in very good condition, but at least a picture of the whole sword would be needed to judge the overall condition. All else being equal, early dated examples are worth more than later dates. Pre-1860 (1858/1859) examples are usually worth a premium; 1865-dated examples are usually worth less than others because most 1865-dated swords were probably received too late to have seen action in the Civil War. The date of your sword should be marked on ricasso opposite the Ames logo together with a "U.S." and the inspector's initials. A good way to get a feel for the value would be to run a search of eBay completed sales for Ames M1860 cavalry sabers. Only look at the swords that actually sold - the owners of many of the unsold swords set wildly unreasonable prices on their items.