In Danish: Bundtryk De første danske og dansk-vestindiske mærker er forsynet med et bundtryk (eller undertryk) af diagonale bølgelinier, der først blev fremstillet I kobbertryk og senere I bogtryk. Bundtrykket findes I fire forskellige stillinger
Google translate will put it in English for you but "undertryk" nicely translates to Germania's "underprint."
Note that the burelage is different on the Ferslew printing and the Thelle printing. The have the same pattern, but the Ferslew is engraved and has a raised ink feel. Oh, and the panes to the left and right of the sheet have it mirrored and they're well known with the burelage inverted as well. So you need to get four from each printer. :)
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