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.�
The Königsberg example cited above is the only one known.