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In the '20s there were several innovations, hounded by competition [[Onoto]] began to produce [[lever filler]] models, the [[Onoto 7xxx|7000]] and [[Onoto 8xxx|8000]]. The introduction date of these models is uncertain and various sources report either the [[1922]], [[1923]] or [[1924]].<ref>respectively [http://www.penmuseum.co.uk/master%2011.htm here], [https://onoto.com/story/onoto-history here] and [http://hubpages.com/hub/A-Brief-History-of-Onoto-Pen here]; Andreas Lambrou speaks of a 1924 patent.</ref> In [[1924]] was also produced the [[Mammoth 1800]] model, a pen with a large number 8 nib, and the following year the [[Princess Mary]] a model made in blue colored hard rubber. It was also started a production of pens simply called ''De La Rue'', from which is known the [[Swift]] model. The company continued to resist the trends and innovations, as well as the introduction of celluloid is quite late; even in this case are given different dates,<ref>respectively [http://www.penmuseum.co.uk/master%2011.htm this] gives the 1926 and [https://onoto.com/story/onoto-history this], [http://hubpages.com/hub/A-Brief-History-of-Onoto-Pen this] and Andreas Lambrou the 1928.</ref> the [[1926]] or [[1928]].

In the '20s there were several innovations, hounded by competition [[Onoto]] began to produce [[lever filler]] models, the [[Onoto 7xxx|7000]] and [[Onoto 8xxx|8000]]. The introduction date of these models is uncertain and various sources report either the [[1922]], [[1923]] or [[1924]].<ref>respectively [http://www.penmuseum.co.uk/master%2011.htm here], [https://onoto.com/story/onoto-history here] and [http://hubpages.com/hub/A-Brief-History-of-Onoto-Pen here]; Andreas Lambrou speaks of a 1924 patent.</ref> In [[1924]] was also produced the [[Mammoth 1850]] model, a pen with a large number 8 nib, and the following year the [[Princess Mary]] a model made in blue colored hard rubber. It was also started a production of pens simply called ''De La Rue'', from which is known the [[Swift]] model. The company continued to resist the trends and innovations, as well as the introduction of celluloid is quite late; even in this case are given different dates,<ref>respectively [http://www.penmuseum.co.uk/master%2011.htm this] gives the 1926 and [https://onoto.com/story/onoto-history this], [http://hubpages.com/hub/A-Brief-History-of-Onoto-Pen this] and Andreas Lambrou the 1928.</ref> the [[1926]] or [[1928]].