I had a long post building (then lost it) from other sources regarding cast brass hilts but in going through Peterson, Neumann, Bazelon, both Mowbray's along with Flayderman's Medicus; There really is no indication that the sword hilt (or complete venture) was made in America, nor that it was a regulation pattern.
Brass was not at all as common on the American scene of casting because of availability and not until Prahl's cast hilts of the turn of the century do we even see those. There is much more evidence that the cast lion hilts were of European manufacture. There was a severe lack of imported brass for the American's during the later war of 1812 but even back to the wide expanses of horseman's sabers of earlier decades, even the lion pommel variations were less common amongst many lists and indeed by the authors listed above. In the Medicus collection pages regarding the lions of the 18th century, 3 out of four were English made and slotted hilts. The one listed as American is a more complex half basket. None of those with cast grips. Neumann lists one cast gripped lion hilt but leaves origin of the maker open. Bazelon's collection of PA book has a very nice brief of Prahl's revolution contracts of 1776 and later. None until the smooth brass cast grips of the later period are listed as animal forms at all.
The Philly light history I have more notes for here and there but the 4th light of the revolution inducted in that area and initiated there as a regional muster as it were with Maryland, Virginia and Deleware also sending troops that direction.
The Peterson example which is quite like yours and etched to both the owner and the Philly's was/is much more likely to be an officer;'s private purchase than a standardized pattern. The Phral contracts of 1776 while not being well described in the brief bios are regarded somewhat in the much more common iron hillted stirrup type hussar varieties later transitioning to the balled grips and rounded dove head, European influenced again. Neumann and the Medicus title put these more standardized patterns in my mind as prevalent, whether slots, wagon wheels or the simple stirrups.
Long excuse short
I think it more likely it is of European manufacture than Philadelphia or the rest of the east coast at that time line. Less refined pommels and guards, surely but I honestly can't suspect the cast grips as U.S. made.
Cheers
GC