Those plates seem to be well documented as seen here
http://picasso.tamu.edu/picasso/WorksInfo?CatID=OPP.52:011
and
http://picasso.tamu.edu/picasso/WorksInfo?CatID=OPP.52:101
thanks for the advice
now for sale on ebay:
http://cgi.ebay.at/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MESELX:IT&…
http://cgi.ebay.at/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MESELX:IT&…