Modifiche

In the following models the logo was simplified by removing the circle, and keeping the "S" surrounded by rays like a sun, in addition the filler button was made in white color to make it more visible. In [[1931]], driven by competition suffered in previous years, particularly because of the [[Osmia]] and its production of celluloid [[Duofold]] on behalf of the [[Parker]], also [[Soennecken]] began to use this to this material. So the [[Rheingold]] series became available, as well as in the classic black, in blue, green, red and brown, with a luxury model in ''Pearl and Black''. The new celluloid models were available in three sizes, 912, 913 and 916, there was also an economic model with the number 305 andd no logo on the cap, available in black, blue, red, green and marbled pearl-edged blacks , and another economic model marked with the number 406.

In the following models the logo was simplified by removing the circle, and keeping the "S" surrounded by rays like a sun, in addition the filler button was made in white color to make it more visible. In [[1931]], driven by competition suffered in previous years, particularly because of the [[Osmia]] and its production of celluloid [[Duofold]] on behalf of the [[Parker]], also [[Soennecken]] began to use this to this material. So the [[Rheingold]] series became available, as well as in the classic black, in blue, green, red and brown, with a luxury model in ''Pearl and Black''. The new celluloid models were available in three sizes, 912, 913 and 916, there was also an economic model with the number 305 andd no logo on the cap, available in black, blue, red, green and marbled pearl-edged blacks , and another economic model marked with the number 406.

In [[1933]] the [[Rheingold]] series was restyled and produced in four different sizes; models were given the numbers 1911, 1913, 1915 and 1917. These were joined by a few second-tier models: the 306 produced in black, blue and pearl, and the 205, an economic pen, also called ''Seneca''. Was also produced a stilographic pen for technical drawing, numbered  as 560A. In [[1935]] was introduced the luxury model [[Präsident]], with the body equipped with a transparent section and a new filling system, then used also on [[Rheingold]].

In 1933 the [[Rheingold]] series was restyled and produced in four different sizes; models were given the numbers 1911, 1913, 1915 and 1917. These were joined by a few second-tier models: the 306 produced in black, blue and pearl, and the 205, an economic pen, also called ''Seneca''. Was also produced a stilographic pen for technical drawing, numbered  as 560A. In 1935 was intrduced the luxury model [[Präsident]], with the body equipped with a transparent section and a new filling system, then used also on [[Rheingold]].

During those years the increasing success of the piston filler introduced by [[Pelikan]] pushed even [[Soennecken]] to adopt this system with the  [[Soennecken 1306|1306]] model. It was built ​​according in an extremely robust way as the fixing pin and the piston were made ​​of brass. Despite this new system [[Soennecken]] pens were marketed at a price lower than equivalent models of the [[Montblanc]] and [[Pelikan]]. At the same time was marketed an economic model for students, the [[Soennecken S4|S4]], also called ''[[Soennecken S4|Sütterlin]]''.  

During those years the increasing success of the piston filler introduced by [[Pelikan]] pushed even [[Soennecken]] to adopt this system with the  [[Soennecken 1306|1306]] model. It was built ​​according in an extremely robust way as the fixing pin and the piston were made ​​of brass. Despite this new system [[Soennecken]] pens were marketed at a price lower than equivalent models of the [[Montblanc]] and [[Pelikan]]. At the same time was marketed an economic model for students, the [[Soennecken S4|S4]], also called ''[[Soennecken S4|Sütterlin]]''.