Flues



If 'G' or 'T' it may be Gautier or Tacony. Gautier Steel was a division of Cambria Iron Co., Allegheny Co., PA. Dudley G. Gautier was president of the Philadelphia Steel & Forging Co. and D.G. Gautier & Co. was listed as an agent for both Sanderson Brothers & Co. and Tacony Iron Works (1881-1910) of Philadelphia.
We've seen Smith barrels with 'F', 'P' and 'C'

In addition to Sanderson Bros. Steel Works in Syracuse, New York, Crucible operated the following steel works in 1902.
https://books.google.com/books?id=2yYqAAAAYAAJ&pg=PA331&lpg
Pennsylvania
Aluquippa Steel Works
Beaver Falls Steel Works
Black Diamond Steel Works
Crescent Steel Works
Howe, Brown & Co. Works
La Belle Steel Works
Pittsburgh Steel Works
Singer, Nimick & Co. Works
New Jersey
Atha Steel Co.
West Bergen Steel Works

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