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3mm Horizontal Bar Printing Variety

 
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Posted 05/23/2020   8:34 pm  Show Profile Bookmark this topic Add ThomasGalloway to your friends list Get a Link to this Message
Notice the 3mm horizontal bar on the three examples below:





I have a couple more, adding to the three above. All 3mm and all horizontal printing artifacts.

The watermarks for these range from W15 (1907-1910) to W47 (1961-1964).

That's a long time for an EFO type to persist. Any print experts out there who might opine on these EFOs?
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