This is a Jefferson 14″ Backsaw sold by Sargent. Their designated #41.

I’ve Lightly cleaned and sharpened this. 

According to Hand-Saw makers of North America (Erwin L. Shaffer) Sargent sold saws by several saw makers–e.g. Disston, Simons, E.C. Atkins and C.E. Jennings. 

I believe this one was from the Disston Jackson line.

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Sargent 1911 catalog