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In the mid '20s also [[Aurora]] started production of [[celluloid]] pens, and in [[1927]] introduced the [[Aurora Duplex|Duplex]] series,<ref>there are some wrong references to this series as the [[Internazionale]], for example in the Enrico Castruccio book ''La Penna''.</ref> which name was chosen in the results of a competition. The pen was a [[lever filler]], proposed in four measures. I was a clear imitation of the [[Duofold]] with the cap head in black hard rubber and a ball [[washer clip]]. But unlike the [[Duofold]] the top models of [[Aurora Duplex|Duplex]] have a metal clip with enchased with a fine filigree decoration, which makes the [[Aurora Duplex|Duplex]] a real jewel of the Italian style.

In the mid '20s also [[Aurora]] started production of [[celluloid]] pens, and in [[1927]] introduced the [[Aurora Duplex|Duplex]] series,<ref>there are some wrong references to this series as the [[Internazionale]], for example in the Enrico Castruccio book ''La Penna''.</ref> which name was chosen in the results of a competition. The pen was a [[lever filler]], proposed in four measures. I was a clear imitation of the [[Duofold]] with the cap head in black hard rubber and a ball [[washer clip]]. But unlike the [[Duofold]] the top models of [[Aurora Duplex|Duplex]] have a metal clip with enchased with a fine filigree decoration, which makes the [[Aurora Duplex|Duplex]] a real jewel of the Italian style.

[[Image:Aurora-Duplex-Medium-PearlBlack-Chiusa.jpg|thumb|left|Aurora [[Duplex]]]]

[[Image:Aurora-Duplex-Medium-PearlBlack-Chiusa.jpg|thumb|A [[Aurora Duplex|Duplex]] model.]]

In [[1929]] the company was restructured taking a strategy of trade diversification; on that occasion were created two new sub-brands: the ''[[Olo]]'', which later become an official sub-brand, which was focused on the production of economic pens, cheaper than the [[Aurora]] branded, sold outside the stationeries, and the ''[[ASCO]]'', dedicated to the production of very economic pens for the lower end of the marked, initially aimed to produce advertising or promotion fountain pens, for the gift items market, but then expanded in the mail orders market.

In [[1929]] the company was restructured taking a strategy of trade diversification; on that occasion were created two new sub-brands: the ''[[Olo]]'', which later become an official sub-brand, which was focused on the production of economic pens, cheaper than the [[Aurora]] branded, sold outside the stationeries, and the ''[[ASCO]]'', dedicated to the production of very economic pens for the lower end of the marked, initially aimed to produce advertising or promotion fountain pens, for the gift items market, but then expanded in the mail orders market.