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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.

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 [[:File:Waterman-42-Overlay-Kosca-GreekEnamelBand-Back.jpg|examples]] of such pens.  

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 [[:File:Waterman-42-Kosca-Overlay-Back.jpg|examples]] of such pens.

The production of the second half of the '30s was in [[celluloid]], in three sizes with a faceted clip embossed with  ''Kosca'' imprint and decorated with a patterned band between two thin rings.

The production of the second half of the '30s was in [[celluloid]], in three sizes with a faceted clip embossed with  ''Kosca'' imprint and decorated with a patterned band between two thin rings.