Yes, I have Bazelon's Pennsylvania book from 1987 in hand. He has one crude dog cast hilt. I think we are also looking at the context a bit differently when he writes "The one piece brass hilt is typical of Philadelphia swordsmithing. The pommel is the 'dog's head' motif'
andthe 34 3/4" blade is hand drawn from a single piece of steel." Underline mine to show his syntax in regarding the overall (all parts) of the cast hilt, slotted hilt, long crude variation as typical of Philly make. A couple of pages later is the Rose light horse ca 1795, lion, composite grip and slotted guard. Why he lists the rose as the revolution with that date with naught but the blade marked Rose. " These dates (93-95) are approximately those which can be attributed for this sword
on stylistic grounds 
underline mine again. Nothing in the makers of Philadelphia section of that book regarding cast hilts. I do probably need more Bazelon along the line but may see duplicate informations from the compilers like Dick Bezdek (and woe is, kinda like me).
A break for Peterson here. Do you mean J Meyers 1785-1804 or maybe his family at large? Peterson references #80 silver five ball spadoonky Also a Myer Myers of NY as a silversmith (smallsword). Peterson silver lions and dogs. The blade of 39 shows traces and IDed as Prahl but the cutlery work/silver Wiltberger. Dogs, none to mention in that silver section.
So let us look again at the elder Mowbray in 1988 regarding brass casting in Philadelphia. He begins with the silversmiths and American makers. Not one hilt with a cast handle mentioned, eagle or not. Lots of information on borrowed and imported parts and blades. On to Philly. Prahl and Rose are fairly well bio'd then as now. In glowing optimism he writes " As a specialty, the swords of Philadelphia have no peers, providing the meatr and potatoes-and more than a little of the caviar- to the collector of American swords." His maker list for the Philly eagles is quite meager as charted directly below that quote. However, it is Prahl, Rose, Weaver, Widmann and Horstmann that might be the most prolific in the waning of classical and federalist tastes as well as common forms. Lets go on to cast brass hilts specifically. Prahl type 1 1800. The only spiraled grip is not surprisgly (to me) not cast brass but rather a Rose blade with a Prahl pommel
" In absence of any information that Rose was ever involved in the founding of brass, it is assumed this arm constitutes a "marriage" of a Rose blade..." Type 1 is a mix of stirrup and slots, as are on occasion the type 2. The type 3 listed as possibly an older version as it is owner named/marked five years after Prahl's death in 1809. A cast McLaws eagle dated to 1805 and abstraclty quoted here for description "Although the brass work is quite artistic, it little resembles the much less streamlined normally associated with Prahl" . Concl
Philly brass in chapter 41 "The results ranged from highly-stylized, near streamlined, efforts to a calculated degree of crudity." He shows a Rose like hanger/nco type blade that's cast hilt is smooth like a Prahl effort. Adjacent, A European hanger, possibly French with a cast bird hilt from half a century earlier.
Chptr 42 the Federal Lancer hilt What more to say? This is a prelude to dismissing the capabilities of Philly/Quaker foundries in lieu of the advances marching forward in Europe. "...the design of the hilt with its stylized eagle represents an art-in-metal school that seems alien to any in vogue in America (circa 1815) See also Medicus notes A Flayderman example with a spiraled similar lancer "this short sabre is nearly identical to the previously illustrated example"
I could pull out more from the Rose examples of blades but blades is what Rose is most known for regardless of their other contracts. No casting by them known.
So I have Bazelon, Mowbray and Flayderman pretty much covered in denying the spiraled cast grips with the exception of the dog in Bazelon's unknown maker example. Mowbray ends the cast hilt with the lancer eagle and we see some other air-srteam models coming in and specifically noted by Mowbray as the advances in Sohlingen. He is prefacing in that chapter for volume II of the eagles which later becomes Stuart Mowbray's work with Flayderman to use the Medicus collection as a pretty good do-all for all swords of the American military histories. This written, it is apparent Bazelon and Mowbray did co-operate as publisher and editor with the 1992 article perhaps too little too late in going back to re-publish both the PA collection book and the elder Mowbray's eagles.
If then Stuart's editing along with Flayderman offers the best balanced fence sitting we know of regarding dogs lion and eagles (oh my) then the earlier notes are left as entirely contentious but even Mowbray the elder is writing in his book that Philly cutlers and foundries were simply not up to par with overseas castings. The Medicus collection book is as much a bible to me now that I have it as Peterson was even before starting there and reading online.
Long post but where I began the other day.
Cheers
GC