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tonymacg, I'm confused about this subject because I've seen items listed as double impressions on various auctions sites, items in which the double impression is confined to only a portion of the printed area.
Is this incorrect?
Many of these listings may indeed by wishful thinking. A double impression of the printing plate should produce a double impression of the stamp.
You can get partial doubling in a number of ways. The sheet of paper may be flapped back against the plate as it's being removed; the plate may 'chatter' as it's being applied to the paper (or vice versa); the paper might shift ever so slightly under the plate - and you can probably imagine other scenarios.
I'm not sure how other catalogues deal with this sort of thing, but Gibbons confines its listings of 'double prints' to true double impressions of the whole plate. Here's another example, from an old-fashioned lithographic stone

(There's probably a German connection here. In the early days, almost all the lithographic stone was quarried in Germany.)
There are other possibilities of course for your stamp. It
could be an example of a reentry. It
could be an example of what Australian George V collectors call a 'compartment line'. I'm right out of my depth in Germany, so I won't comment further on those possibilities.