The U. S. 19th Century Stamped Envelope catalog from the UPSS further breaks out the listings by gum shape (on the flap) and the guide perfs (which assists the user in folding the lettersheet into its proper shape). Also watermarked and unwatermarked.
Just thought I'd add this to the post. A stock certificate of the company who patented the Grant letter card. American Bank Note Co. actually printed both the letter cards and the stock certificate.
The Grant lettersheet *is* a sealed postcard. This is the only product the company produced.
As for the enlarged picture, I simply posted a fairly large scan. The forum automatically downsizes it for the topic. Then when you click on it, it expands to full size.
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