1933, two unperforated essays the Reich printing house in green colour in steel engraving executed, showing emperor Maximilian and Theodor Mommsen, on specimen cardboard made up, in perfect condition, enclosed copy of a certificate Ludin (1971) for two similar essays in red orange "it is trial impressions the RD, the in the named year carried out were, whereby a clutch of portraits steel-engraved, put on was. Very few known prints! "