Hi there - our family has saved a few pieces of mail from the early 1900's, and I've been doing some research on some of them. One in particular looks like it may be valuable, but I can't find any examples of one (for sale or otherwise) with the cover. I think it's probably a 445, but could be a 456, unless I'm completely off! The date stamp on the cover from Oklahoma is May 7, 1918. Any feedback on this would be greatly appreciated! Thank you!!
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