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The Italian branch was managed by one of the two daughters of ''Christian Schaefer'' (''Margarete Schaefer'', called ''Gretel'') who successfully extended and expanded the production to include fountain pens and mechanical pencils, as well as gold and silver objects such as frames, ashtrays, special cutlery, and then jewellery such as cufflinks, earrings and pendants, some on his own brand and others for great jewelers. Another son of ''Christian Schaefer'', ''Walter Schaefer'', ran a branch (only commercial) in Argentina during the period in which he lived in that country (approximately from 1935 to 1950).

The Italian branch was managed by one of the two daughters of ''Christian Schaefer'' (''Margarete Schaefer'', called ''Gretel'') who successfully extended and expanded the production to include fountain pens and mechanical pencils, as well as gold and silver objects such as frames, ashtrays, special cutlery, and then jewellery such as cufflinks, earrings and pendants, some on his own brand and others for great jewelers. Another son of ''Christian Schaefer'', ''Walter Schaefer'', ran a branch (only commercial) in Argentina during the period in which he lived in that country (approximately from 1935 to 1950).

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]] and for [[Parker]]. At least these last 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''.

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.

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