I was referring to the date on the catalog or later because the Davistown article said this...I felt uncomfortable with stating 1909 so added the question mark. Folks can make their own determination.
Here is a source for the catalog:
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Price List of D. R. Barton Brand Edge Tools : Mack & Co. : Free Download, Borrow, and Streaming : Internet Archive
catalogue of D. R. Barton edge toolsarchive.org
IDK - that is a difficult article for me to figure out the Barton tools evolution.
However, this part seems consistent with 1909 being in the "ballpark":
"Two partners, William R. Mack and Royal L. Mack, took the company over in 1874 and renamed it Mack & Co. They continued to use the original name as a trademark until 1923."
What "later date" are you referring to?
From another Mack & Co / D R Barton catalog:
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Here is a D R Barton mark on a turning gouge that I have been unable to place:
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Bob
"At that point he started stamping his tools D.R. Barton 1832 verses the Mack's were still making tools as D.R. Barton and Company. On April 26th 1875 he passed away after a short illness. His wife and son sold the company back to the Mack's a year later and they used his name for about 5 more years."
That didn't sound right.
I have noticed different stamps on Barton's I will start paying more attention to them. The similarity to the LI & J White trade mark is also interesting.