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All Forums Category: US Stamps and Covers Discussions Forum: US Classic Stamps - As Issued and Used

Fairly Common Ridges On Back Of Classics, What Are They From?

 
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pascoe
Valued Member
United States
363 Posts
Posted 09/17/2018   9:51 pm  Show Profile Check pascoe's eBay Listings Bookmark this topic Add pascoe to your friends list Get a Link to this Message
Hello,

After spending lots of time checking backs of classic era stamps for grills, I have noticed a set of curved ridges that I think must be artifacts from the production process. Reminiscent of a fingerprint. What are they? Thanks for sharing your knowledge. Image highlighting my question below:
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Mike Pascoe, PhD

https://linktr.ee/DissectingPhilately

rogdcam
Bedrock Of The Community
12579 Posts
Posted 09/17/2018   10:24 pm  Show Profile Bookmark this reply Add rogdcam to your friends list  Get a Link to this Reply
They are the impression from the engraved image on the front.
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sinclair2010
Pillar Of The Community
United States
2555 Posts
Posted 09/18/2018   9:01 pm  Show Profile Check sinclair2010's eBay Listings Bookmark this reply Add sinclair2010 to your friends list  Get a Link to this Reply
Technically it is from the paper being forced into the recesses on the plate when the stamp is printed.
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  Previous TopicReplies: 2 / Views: 1,095Next Topic  
All Forums Category: US Stamps and Covers Discussions Forum: US Classic Stamps - As Issued and Used
 
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