As a footnote to this topic, I met Eli Kaufman at an antebellum banjo symposium at UVA in Charlottesville in the mid-nineties. I had recently purchased a practically identical but unbranded banjo to the ST and was considering whether to restore it. I was sitting next to him [with not the faintest clue] and mentioned it since it was outside in my VW van, and he asked to see it so I brought it in during the program intermission. He examined it carefully and concluded that it was probably made by Fred Stewart, Samuel Stewart's son, who had joined with Jos. W. Stern & Co. around 1902 to produce banjos under the eponymous label, SS Stewart's Sons Improved 4S Banjos, which lasted until ~1914.
In the period between his father's death and the resolution of a 5 year lawsuit with Bauer over control of S&B company, Fred continued to both make banjos in house and contract with Rettberg & Lange to produce banjos under the SSSS 4S label. I've compared images of the latter R&L on Mugwumps, and the banjo I have [Eli's estimate ~1903] looks more like the ST, except for the neck carving pattern.
The banjos utilized some leftover [non-Acme] parts from when SS Stewart died in Philadelphia, but the carvings on the neck were different because the designs were patented and belonged to Stewart & Bauer. Nonetheless, the basic motif is the same, even though the pattern is not.
In the end, Bauer won control of the S&B company, and Fred & kin went on to produce the 4S until ~1906, according to Eli. There's no mention of Fred making banjos again until he joined up with a 1920s manufacturer [Marks] to produce the Fred Stewart Musictone 4 string tenor.
Anyway, I can attest that there were 3 producers of the better quality instrument in the short period of 1897-04 as I also have a 1902 S&B ST and a 1897 SS Stewart Banjeaurine and they are all of consistent quality and tone.