Provenance puzzle #2

This armorial stamp graces the front and back covers of several tall folios from the Roman-Canon Law Collection of the Association of the Bar of the City of New York.I have no idea what library this stamp is from, but I have a couple of clues. The binding style (stamped pigskin over boards, with rounded backs) is typically German. Several knowledgeable folks say that the initials also suggest a German library.If you can shed any light or provide any suggestions, please let me know.On my Flickr gallery, in the “Provenance Markings” set, I have posted an image that shows more of the cover and the tooling. Following are the titles bearing this stamp (click on the title to see the full record in our online catalog, MORRIS):

Luca da Penne, Lectura … Super tribus libris codicis (Lyon, 1538) [with] Martin Sanchez, Arbor dividui et  individui (s.l., 1538). (The volume shown here).

Alessandro Tartagni, In Digestum vetus lecturae [with] Lecturae in Digestum novum (Lyon, 1567).

Alessandro Tartagni, In codicem Iustinianeum commentariorum tomus primus et secundus [with] In infortiatum commentaria (Lyon,1567).

Primum volumen[-volumen xvii] tractatuum ex variis iuris interpretibus collectorum (Lyon, 1549; 18 vols. in 11).

MIKE WIDENER

Rare Book Librarian

Lillian Goldman Law Library