WERT
Departed
Rest in Peace
Posts: 1,062
What I collect: Canada and Provinces
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Post by WERT on Jun 30, 2021 1:51:48 GMT
Here is a couple of American stamps that appear to have slip prints.
Robert
AND...
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khj
Member 
Posts: 1,449 
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Post by khj on Jun 30, 2021 3:45:42 GMT
Tagging ghosts?
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angore
Member
Posts: 5,331
What I collect: WW, focus on British Empire
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Post by angore on Jun 30, 2021 9:57:57 GMT
It looks double printing,
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brightonpete
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On a hike at Goodrich-Loomis
Posts: 5,110
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Post by brightonpete on Jun 30, 2021 10:37:37 GMT
It looks to me like the ink was slightly thinner and bled a bit when printed. Something I'd avoid as I'd rather have a better printed example.
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khj
Member
Posts: 1,449
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Post by khj on Jun 30, 2021 20:22:02 GMT
Blotchy secondary image on a non-engraved overall tagged US stamp of latter half of 20th century suggests a tagging ghost. Not common but not uncommon either, on US stamps late 1960s and into 1980s. Look for ones with clear separation between primary and secondary image. Or better yet, for selvedge collectors, look for the ones with a secondary image from a completely different plate number! The secondary image (of one or sometimes more colors) is printed as a result of some wet ink being transferred onto the tagging mat and then transferred back to the next press sheet as it gets tagged. Some call the phenomena ghost tagging, although I prefer calling the actual secondary print a tagging ghost.
If you find them on untagged stamps, or engraved stamps, then slip print becomes more likely.
That's just my opinion without having physically examined the stamps.
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khj
Member
Posts: 1,449
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Post by khj on Jun 30, 2021 20:31:07 GMT
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khj
Member
Posts: 1,449
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Post by khj on Jun 30, 2021 20:38:03 GMT
Don't misunderstand. Not trying to get into a debate over this. Just suggesting other possibilities, given the photogravure printing process and overall tagging step.
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