You might be interested in this manuscript which was recently put online: http://bc.dominikanie.pl/dlibra/docmetadata?id=120&from=&dirids=1&ver_id=&lp=1&QI=
There is a description and several images from it here: http://dominican-liturgy.blogspot.com/2011/06/14th-century-dominican-antiphonal.html
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