That tidbit has been known for a while now. The $100s were being designed before the Jenkins/Dodge signature combo was available, but they were not released until the change had been made. Only some of the concept art displays the K/D signatures. ALL issued notes bear the J/D signatures.
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BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.