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What Is a Change Over Pair? In This Case It's When You Have Two Consecutive Numbered Notes but The Signatures Are Different. See Scan Below You Will See Note S/N A30082652E Has the Signatures of Speelman & White Where S/N A30082653E Has the Signatures of Woods & White.
Front: The Second Note of The Educational Series, Engraved by Charles Schlecht and G.F.C. Smillie After Designs by Edwin H. Blashfield (Figures) and Thomas F. Morris (Frame, Background) Science Presenting Steam and Electricity to Commerce and Manufacture. Back: Heads of Inventors Robert Fulton and Samuel F. B. Morse. The Portraits Are Attributed to Engraver Lorenzo J. Hatch.
