A 450+ page book-come-trade catalogue devoted to tricking out your horses's mouth.
16th century bling. Mad stuff.
'Ein Schönes und Nützliches Bißbuch (Pferdegebisse)' by Mang Sueter is available from the Bavarian State Library. {~A beautiful and useful bit-book (?) for horse teeth} This edition is from 1614, but the original was published in 1582. The images above were extracted from the downloadable pdf and are cropped slightly from the full book pages.