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The ''Haro'' production had a moderate success due to the glass nib, especially for the characteristic to enable writing on multiple layers of carbon paper, widely publicized by the company. The nib was also corrosion resistant for inks and had very little costs, making the pen cheap. The main drawback still remained, beyond the mechanical fragility, that of a much more rapid consumption of the tip, in addition of course to the writing rigidity.

The ''Haro'' production had a moderate success due to the glass nib, especially for the characteristic to enable writing on multiple layers of carbon paper, widely publicized by the company. The nib was also corrosion resistant for inks and had very little costs, making the pen cheap. The main drawback still remained, beyond the mechanical fragility, that of a much more rapid consumption of the tip, in addition of course to the writing rigidity.

First fountain pens were hard rubber [[safety]], slim and straight form, in two sizes distinguished by the inscription ''"Haro I"'' or ''"Haro II"'' on the barrel. Later production used both [[lever filler]] and [[button filler]]. In [[1937]] the ''Haro'', as one of the first companies to jump into the economic production market, gave rise to the publication of a newspaper called ''"Haro-Winkle"''. In this period the production shifted to celluloid colored pens (blue, green and black pearl striated) using the [[piston filler]].

First fountain pens were hard rubber [[safety]], slim and straight form, in two sizes distinguished by the inscription ''"Haro I"'' or ''"Haro II"'' on the barrel. Later production used both [[lever filler]] and [[button filler]]. In [[1937]] the [[Haro]], as one of the first companies to jump into the economic production market, gave rise to the publication of a newspaper called ''"Haro-Winkle"''. In this period the production shifted to celluloid colored pens (blue, green and black pearl striated) using the [[piston filler]].

After the WWII, Silesia was occupied by the Russian and in [[1946]] ''"Hans Roggenbuck"'' was expelled from East Germany, going to live in Bad Merghentheim where he resumed the business with a company for fountain pens repairs, but in [[1948]] re-founded a factory in Regensburg, resuming the production of glass nib fountain pens, to which were joined also pens with ordinary steel and gold nibs, passing to the use of plastic resins.  

After the WWII, Silesia was occupied by the Russian and in [[1946]] ''"Hans Roggenbuck"'' was expelled from East Germany, going to live in Bad Merghentheim where he resumed the business with a company for fountain pens repairs, but in [[1948]] re-founded a factory in Regensburg, resuming the production of glass nib fountain pens, to which were joined also pens with ordinary steel and gold nibs, passing to the use of plastic resins.