These iron-hilted sabers are usually associated with the Philadelphia area as imports from Solingen just after the War of 1812, when we still liked French inspired designs. Mowbray, The American Eagle-Pommel Sword, talks about them on page 168-170. He illustrates one with the same blade, but a slightly different pommel, that has "F.L. No. 5" engraved in the grip, which is thought to represent a militia troop titled the "Federal Lancers." The blade on that one is short, 27 inches, as this one appears to be, which he recognizes as rather short for a cavalry saber, but thinks okay as a lancer's secondary weapon. Though, since they were mostly going to be drawn on parades, it may not have mattered much.
There were all-metal eagle hilts cast over here, but they tend to be brass. That is the reason for thinking that this sword was brought over in its present form, rather than just the blade being imported and the mounting of the hilt done here. Mowbray shows one of the brass hilts that he calls the "Widmann-Horstmann" type on page 196. The US Marine Corps used this type for musicians in two lengths, described as for musicians and boy musicians. This does not mean, though, that any sword with an all metal eagle hilt is a marine sword, or even those with such brass hilts are all marine swords.
In this case, the best description is probably something like an 1815-1820 militia short saber with a patriotic eagle hilt and blade engraving.