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The Italian branch was managed by one of the four 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 its 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 four 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 its 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 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''.

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]], 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''.

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 original headquarters in Pforzheim was closed in the 1960s. Instead, the Milan office, which later moved to via Cadibona 8A, continued to exist successfully for a long time, producing solid gold fountain pens and ballpoint pens in the 1950s, and continuing with ballpoint pens and other objects, when in the 1960s fountain pens left production due to the advent of ballpoint pens. The company remained in the hands of ''Margarete Schaefer'' until 2000, the year of her death, and was liquidated the following year by her niece.

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 original headquarters in Pforzheim was closed in the 1960s. Instead, the Milan office, which later moved to via Cadibona 8A, continued to exist successfully for a long time, producing solid gold fountain pens and ballpoint pens in the 1950s, and continuing with ballpoint pens and other objects, when in the 1960s fountain pens left production due to the advent of ballpoint pens. The company remained in the hands of ''Margarete Schaefer'' until 2000, the year of her death, and was liquidated the following year by her niece.