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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 other companies like [[Columbus]], [[Omega]] and [[Ercolessi]],<ref>the production for [[Ercolessi]] was also confirmed in direct correspondence with the great-grandson of the founder.</ref> and also for the Italian branch of the [[Waterman]] and for [[Parker]]. At least these last two relationships are well established, existing many [[:File:Waterman-42-Overlay-Kosca-GreekEnamelBand-Back.jpg|examples]] of [[Waterman]] safeties and [[Parker]] pens explicitly marked by ''Kosca''.