Taken directly from the Kaweco Catalogue:
Translucent stands for the idea “to make the invisible visible”. As early as the twenties Kaweco representatives were already equipped with a writing instrument cross section pen model. These cross section models were made by cutting serial products in half in order to make the interior mechanisms more visible. However, this process became unnecessary in the fifties through the further development of the injection moulding technique. Translucent models were produced.
The Kaweco ICE Sport has the same characteristics and comes in a colourful variety.