Endpaper sample/swatch book from the Buntpapier- and Leimfabrik A.-G. in Aschaffenburg, Germany, and dated 1901/2. The volume is in the HathiTrust digital collection with the original part of the The New York Public Library's Paul Kersten & Hans Loubier Collections of Books on Bookbinding.
From time to time I will share other books from the HathiTrust.
Regrettably the link will only work for viewers coming in with US based IP-addresses.
Link to the book directly at HathiTrust here.