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All Forums Category: US Stamps and Covers Discussions Forum: US Back of Book

C23 - What Is This Marking?

 
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Author Previous TopicReplies: 2 / Views: 1,432Next Topic  
eyeonwall
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United States
4087 Posts
Posted 05/08/2016   8:27 pm  Show Profile Check eyeonwall's eBay Listings Bookmark this topic Add eyeonwall to your friends list Get a Link to this Message
Any idea what the C in the 5x4 grid of tiny squares is?






(too bad the stamp got the pen cancel treatment)
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1typesetter
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United States
791 Posts
Posted 05/09/2016   08:34 am  Show Profile Bookmark this reply Add 1typesetter to your friends list  Get a Link to this Reply
It identifies the plate as being chromed.
This is process used to make the plate harder so that it would last longer.
The July 2007 United States Specialist has an article on marginal markings.
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eyeonwall
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United States
4087 Posts
Posted 05/09/2016   10:01 pm  Show Profile Check eyeonwall's eBay Listings Bookmark this reply Add eyeonwall to your friends list  Get a Link to this Reply
thank you
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  Previous TopicReplies: 2 / Views: 1,432Next Topic  
All Forums Category: US Stamps and Covers Discussions Forum: US Back of Book
 
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