[[Image:Stilus-415-Overlay-Back.jpg|thumb||Detail of the patented mechanism]]
[[Image:Stilus-415-Overlay-Back.jpg|thumb||Detail of the patented mechanism]]
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At least in the early years is also known an economic production under the brand ''[[Eridania]]'' (also mentioned in a 1948 directory), 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 trademark was used on a later production for celluloid [[button filler]] models.
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At least in the early years is also known an economic production under the brand ''[[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 trademark was used on a later production for celluloid [[button filler]] models.