I bought a medieval manuscript leaf | (It got emotional...)

I can't believe I own this medieval (15th century) leaf from an antiphonal.

Back in early March I attended the New York International Antiquarian Book Fair. You name it, they had it: rare books, manuscripts, first editions, personal letters, signatures, and more. The history lover in me was IN AWE. And of course, I had to buy something....
Thanks for watching. :)
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Website that I used to learn more: https://dsps.lib.uiowa.edu/ifbookscouldtalk/2015/07/28/episode-3-can-we-learn-anything-from-a-single-manuscript-leaf/
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Видео I bought a medieval manuscript leaf | (It got emotional...) канала The Curious World