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    Porter Counterfeit Detector.
    This is the equal of the finest example of this rare counterfeit detector that we have seen. The wood case is flawless but for a few minor surface scratches, the glass is perfect and original, and every knob, screw, and moving slide is original and without damage or wear. Press in the front knob and the lid opens. This detector operated on the basis of placing a genuine note on one sliding panel and a suspected counterfeit on the other, and then by manipulating the panels, the notes could be drawn into line on the alphanumeric graph, and the position of various elements could be compared. In short, it was pretty much useless, but what a fancy package. Included with this detector are copies of the original instruction sheet. Over the years, we've seen about ten of these detectors, only one other of which is as well preserved as this beautiful piece. Most Porters have had their glass broken and replaced at some point, but not this one. The original glass is etched with graph lines. This detector contains two genuine modern 2003 $1 notes for demonstration purposes. The exact dates on which these counterfeit detectors were manufactured is a matter of conjecture, but materials and craftsmanship seem to indicate the 1920s. The instruction sheet with this detector has an overprint export-agent name and address, which indicates that these were still being sold in the 1940s, as the agent's San Francisco address includes the two-digit postal-zone number, which came into use in May of 1943. It is also housed in a black slip case and ready for an advanced collector.

    Auction Info

    Auction Dates
    November, 2008
    25th Tuesday
    Internet/Mail Bids: 10
    Lot Tracking Activity: N/A
    Page Views: 1,222

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