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But there is also a German company in Pforzheim in Germany, called ''Kohler & Schaefer'' which holds several patents related to fountain pens and other writing instruments, for which it is not known any relationship with the Milanese company (if the parent or other). But the possibility that these were two completely independent companies with the same name composed of two identical surnames (''Kohler & Schaefer'' also appears in the records of Italian brands) is considered very unlikely.

But there is also a German company in Pforzheim in Germany, called ''Kohler & Schaefer'' which holds several patents related to fountain pens and other writing instruments, for which it is not known any relationship with the Milanese company (if the parent or other). But the possibility that these were two completely independent companies with the same name composed of two identical surnames (''Kohler & Schaefer'' also appears in the records of Italian brands) is considered very unlikely.

Come per la [[Uhlmann's Eterno]] la produzione iniziale era principalmente di rivestimenti per penne in ebanite, che sono considerati fra i migliori in assoluto. Si ritiene che la ditta li abbia prodotti anche per conto di aziende più famose come [[Columbus]], [[Omega]] ed [[Ercolessi]], ed anche per la filiale italiana della [[Waterman]]. Almeno quest'ultima relazione è accertata, essendovi esempi di tali penne.  

As for the [[Uhlmann's Eterno]] initial production was mainly of hard rubber pens [[overlay]]s, which are considered among the best ever. It is believed that the company have produced them also on behalf of the most famous companies like [[Columbus]], [[Omega]] and [[Ercolessi]], and also for the Italian branch of the [[Waterman]]. At least this last relationship is well established, existing many examples of such pens.  

La produzione della seconda metà degli anni '30 era in [[celluloide]], in tre misure con una clip sfaccettata recante l'incisione ''Kosca'' ed una decorazione con una banda a motivi geometrici fra due anellini sottili.

La produzione della seconda metà degli anni '30 era in [[celluloide]], in tre misure con una clip sfaccettata recante l'incisione ''Kosca'' ed una decorazione con una banda a motivi geometrici fra due anellini sottili.