Modifiche

The initial production until the late '20s consists mostly of safety or eyedropper pens in hard rubber, style and construction was similar to the other contemporary production. They were made ​​with wavy patterns and there are also some versions in distinctive color and mottled hard rubber. There are however some different safety models that refers to a specific patent for mounting the inner spiral, which is hooked by a screw on the bottom. These models have are marked in the barrel with an inscriptions reporting in three lines ''Brevetto'', ''Stilus'', ''Pecco e C. Torino'', and in the bottom, there is another inscription reporting the word ''Brevettata'' (patented) in addition to the brand name and model number.  

The initial production until the late '20s consists mostly of safety or eyedropper pens in hard rubber, style and construction was similar to the other contemporary production. They were made ​​with wavy patterns and there are also some versions in distinctive color and mottled hard rubber. There are however some different safety models that refers to a specific patent for mounting the inner spiral, which is hooked by a screw on the bottom. These models have are marked in the barrel with an inscriptions reporting in three lines ''Brevetto'', ''Stilus'', ''Pecco e C. Torino'', and in the bottom, there is another inscription reporting the word ''Brevettata'' (patented) in addition to the brand name and model number.  

[[Image:Stilus-415-Overlay-Back.jpg|thumb||Particolare del fondello brevettato]]

[[Image:Stilus-415-Overlay-Back.jpg|thumb||Detail of the patented mechanism]]

At least in the early years is also known an economic production under the brands ''[[Eridano]]'' and ''[[Eridania]]'', usually accompanied by a model number, and sometimes by the letters ''PCT'', as an acronym of ''Pecco and C., Turin''. The initial production were eyedropper or safety hard rubber pens, in four different sizes. The same mark was used on a later production for celluloid button filler models. It is also believed that the company has produced parts and pen for other brands, and some believe that also the brand ''[[Scriba]]'' is attributable to [[Stilus]].  

At least in the early years is also known an economic production under the brands ''[[Eridano]]'' and ''[[Eridania]]'', usually accompanied by a model number, and sometimes by the letters ''PCT'', as an acronym of ''Pecco and C., Turin''. The initial production were eyedropper or safety hard rubber pens, in four different sizes. The same mark was used on a later production for celluloid button filler models. It is also believed that the company has produced parts and pen for other brands, and some believe that also the brand ''[[Scriba]]'' is attributable to [[Stilus]].