While collecting the first issue major double transfers is not a ginormous challenge (although there a few I'm still missing), finding them still on documents is. I'm now up to a half dozen or so on document.
The three documents below are a nice addition, in that they are all on documents from the same company, checks from the Pittsburgh Steam Brick Co. All three are silk papers.
In order, they are the T15, T15a, and a Scott-unlisted double transfer, one that I've seen before and have other examples of.
Plate varieties and anomalies (double transfers, foreign entries, doubled framelines, plate cracks, plate scratches) are all sorts of fun to hunt down.
I've got some reference pages for these that I've been working, trying to put together pictures showing the diagnostics:
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