拍品专文
                                cf. Victor Arwas, op. cit., p. 158.
Professor Otto Poertzel was a Berlin designer who worked on an occasional free lance basis for Ferdinand Preiss' firm, Preiss & Kassler, and was also employed by another Berlin foundry, Rosenthal und Maeder.
                            
                        Professor Otto Poertzel was a Berlin designer who worked on an occasional free lance basis for Ferdinand Preiss' firm, Preiss & Kassler, and was also employed by another Berlin foundry, Rosenthal und Maeder.
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