Adlung lists this stop with the following description:
Coppendoff 2 and 3 is [found] in the Kneiphof (or Cathedral) at Königsberg. I know nothing really conclusive about it, but I surmise that it is the same thing that others call the Koppel, if by that [term] is understood a stop that consists of two ranks of pipes, in particular the Rauschpfeife.
Wedgwood also lists it, but says only “Coppendoff - 2 ft.; 2-2/3 ft. Königsberg. Perhaps Coppell Döff.”
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Coppendoff.html - Last updated 18 April 2003.