Piece of plastic stained magenta, then had the design cut out on a CNC machine or similar. Pencil marks indicate the middle of the design. Paper on the back covering some kind of sticky backing? A simplified version of the design.
Use
Finishing tool for bookbinding.
Collection
Hoole Machine and Engraving Works Collection
Lexicon
Search Terms
Tools., Book ornamentation, Bookbinding, Finishing., Hand binding.