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The [[Radius]] initial production was divided in two lines: the [[Radius Superior|Superior]] for the more valuable high-end pens and more valuable, and the  [[Radius Extra|Extra]] for second tier pens sold at lower prices. The [[Radius Superior|Superior]] line remained in production, with different stylistic and technical changes, including the implementation of [[Radius Superior Trasparente|Trasparente]] version, until the '50s, while the [[Radius Extra|Extra]] line was decommissioned in the late '40s, replaced by other economic production, such as the [[Comet]] and the [[Radius 31]], [[hooded nib]] models of much lower quality than its predecessors.

The [[Radius]] initial production was divided in two lines: the [[Radius Superior|Superior]] for the more valuable high-end pens and more valuable, and the  [[Radius Extra|Extra]] for second tier pens sold at lower prices. The [[Radius Superior|Superior]] line remained in production, with different stylistic and technical changes, including the implementation of [[Radius Superior Trasparente|Trasparente]] version, until the '50s, while the [[Radius Extra|Extra]] line was decommissioned in the late '40s, replaced by other economic production, such as the [[Comet]] and the [[Radius 31]], [[hooded nib]] models of much lower quality than its predecessors.

Negli anni '50 infatti (almeno così compare in [[:Category:Catalogo-Tentardini-195x|questo catalogo]]) alla linea [[Radius Superior|Superior]], che nel frattempo aveva assunto linee affusolate seguendo le tendenze stilistiche del periodo, vennero affiancati modelli più economici come la [[Comet]] (con un pennino alato molto simile a quello delle [[Montblanc 25x]]) e la [[Radius 31]], un modello a [[pennino coperto]] di qualità nettamente inferiore ai suoi precedessori. Nello stesso catalogo si nota la presenza di un ulteriore modello, la [[Fortune 38]], chiara imitazione della [[Pelikan 400]].

In the '50s in fact (at least so it appears in [[:Category:Catalogo-Tentardini-195x|this catalog]]) the [[Radius Superior|Superior]] line, which in the meantime had taken on ogival lines following the stylistic trends of the period, was flanked by cheaper models such as the [[Comet]] (with a winged nib very similar to that of the [[Montblanc 25x]]) and the [[Radius 31]], a model with [[hooded nib]] of much lower quality than its predecessors. In the same catalog we note the presence of an additional model, the [[Fortune 38]], a clear imitation of the [[Pelikan 400]].

There is no known date of termination of production under the [[Radius]] brand, but it is placed in the second half of the '50s (but certainly later than [[1956]], appearing [[SAFIS]] in [[:File:1956-Annuario-General-Industria-Stilografiche-A.jpg|this yearbook]] of that year) considering it concomitant with the cessation of activities of the parent company, which was probably put out of business by the success of ballpoint pens. However, there are no reliable documents or precise indications about the cessation of activities.  

There is no known date of termination of production under the [[Radius]] brand, but it is placed in the second half of the '50s (but certainly later than [[1956]], appearing [[SAFIS]] in [[:File:1956-Annuario-General-Industria-Stilografiche-A.jpg|this yearbook]] of that year) considering it concomitant with the cessation of activities of the parent company, which was probably put out of business by the success of ballpoint pens. However, there are no reliable documents or precise indications about the cessation of activities.