I don’t normally collect non-Scott-listed deep back of book material, but I do love plate and printing anomalies, especially ones with nice aesthetics. I had my eye on this one for quite some time, but simply wasn’t willing to pony up the money. Well, an opportunity presented itself to make the stamp part of a trade, which lowered the cost considerably, so I bit.
Springer # TA236b, double impression. Fairly dramatic, more so than most 20th century double impressions one encounters.