Longer answer...
Assuming you're not talking about Mr. C.S. Bonney's adjustable pipe wrenches (made by Kraeuter and dating to 1903 after he sold his stake in Bonney Vise & Tool Works...) or Bonney Vise & Tool Works VIXEN-branded "Crocodile" wrenches (made as early as 1913 and so-called to avoid Roebling's "Alligator" trademark), as seen in Pics 1 & 2 below, but end wrenches, that question - "earliest known", has been somewhat of a periodic subject of research, discussion, and congenial debate on this thread.
In summary, the situation with early Bonney end wrenches is much more nuanced and complex than what one might take away from a reading of AA.
We here, and on TA 2.0 as a reference website, are more helpful in recognizing that the move to Allentown took place in 1909, not 1906, that the "Princeton" shield (as we call it here), trademarked in 1913, included more than just cement working tools - as AA erroneously states, appears by itself in various forms (Full shield, full shield with a small 'B' only on the bottom under the chevrons, and a mini shield with only a big 'B' inside) on wrench shanks irrespective of it being embedded in the BONNEY name (e.g., BON{/}NEY) on wrench faces, which AA gives little to no credence to, and, that there are additional variations within that era to be sequenced, such as one or two chevrons in the shield, a 'MADE IN U.S.A.' marking or not, as well as the size conventions (e.g., S.A.E., U.S.S. etc) or not.
In general, though, all end wrenches without a date code are early, all made before 1921.
Most of the wrenches on the board in Pic 3 below were made before 1921, and after 1914, bearing B-shields on the shanks, most without and some with 'MADE IN U.S.A.', and the embedded shield logo (BON{/}NEY).
I have pulled off a couple of oldies in Pics 4, 5, & 6.
Neither has a date code. So older than 1921. One is similar to the wrenches on the board, as I described above, but has no B-shield on the shank. Probably early. Could pre-date that B-shield convention. The other, unlike most of the wrenches on the board, an dmost early wrenches we see, just has a B-shield on the shank, no Embedded Shield logo. Probably contract production. But could be early production, after they TM'd the shield, but before they started using the Embedded Shield logo (which they never TM'd).
In my personal opinion, a good argument for the oldest end wrench on this thread could be made for RagTopTA's malleable iron wrench on Page 74, Post #1468, as alluded to in the short answer. It only has one marking, a plain BONNEY name surrounded by a very faint jellybean. 'BONNEY' in a jellybean shaped oval (so-called "jellybean" logo) has been seen on some early end wrenches, specifically 'S' wrenches. This logo was not TM'ed. But I believe it is a version of the arching 'BONNEY' that was TM'd in 1908, first use 1876.
An equally and maybe even strong argument could be made for another malleable iron model, owned by leg17, shown on Page 154, Post #3066, as alluded to in the short answer. It only has one marking - the Princeton shield with the small 'B' under the chevrons that can be seen on early vises and my Vixen "Crocodile" wrench above.
Note in that same post leg17 has an 'S' wrench with the Bonney jellybean logo. The same wrench also has an embedded shield Bonney logo on the face of a jaw. I think it's a very early transitional. After 1913, when Bonney claims first use for the shield, but barely. In contrast, AA shows an 'S' wrench in Figure 3 on page 1 of its Bonney section that only has a Bonney jellybean logo, suggesting that it was made prior to 1913.
That earliest Allentown period (1909 to 1912) is the dark gap for us Bonney collectors. Few specimens and NO catalogs. We have an 1886, an 1888, and a 1914.
There is no evidence that Bonney Vise & Tool Works made end wrenches in Philadelphia prior to 1909.
Other than the jellybean logo only "S" wrench on AA, there is little to no evidence that Bonney Vise & Tool Works made end wrenches in Allentown after 1909 and before 1913.