No catchy title, Mail Art and more.

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 I'm trying to find a pattern to replicate this little folder.

I made it a long time ago, and ended up sewing it into a little art book.

I thought the pattern was in a book but I can't find it in any of the ones that I have. Could have been a library book or a book that I lent out.

I think it was given as a Stamp Holder.

Does anybody recognize this?

inside

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