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Is this an error or a mule on a National? My Salem, OH FNB Ch. # (M)43 Fr. 650 Lyons | Roberts SN 5227/V967961B pp A/315 PMG 30EPQ beautiful signatures by Cashier Church and Pres. Pow dated Apr 11, 1902. Much more common with Speelman | White signatures as a plain back. The back plate is 315. Notes from this bank dated Apr 10, 1922 carry the Speelman | White signatures and $20s have known back plate numbers of 722 and 1018 (see below)
Fr. 661 SN 1481/Y322423E pp A/722
Fr. 661 SN 5147/Z451299H pp A bp not listed in census
Fr. 650 SN 5227/V967961B pp A/315
Fr. 661 SN 8430 pp A/1018
Since all the $20 examples are from the A plate, and $10s are from an A or C plate, I suspect sheets of 3 $10s and 1 $20 were ordered (see Heritage's Auction archives). The low back plate number (315) is probably meaningless. The bank SN of 5227 comes between 5147 and 8430, so I suspect the old plate with Lyons | Roberts signatures used for date backs was mistakenly placed back into service as more plain backs were printed. Since I don't have access to a current National Bank Note Census, I don't know if there are any other plain backs known for Ch. 43 with Lyons | Roberts signatures.
You should be able to see my set of OH nationals here: https://notes.www.collectors-society.com/registry/notes/MySets_Listing.aspx?PeopleSetID=16150&SelectedTab=SetListing