Modifiche

[[File:Stilus-25-Overlay-Capped.jpg|thumb|left|[[Stilus]] #25 [[overlay]] ]]

[[File:Stilus-25-Overlay-Capped.jpg|thumb|left|[[Stilus]] #25 [[overlay]] ]]

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 ({{Cite patent|DE|368196}}) 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||Detail of the patented mechanism]]

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