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This changed only after the mid '30s, when the role of [[Aurora]] sub-brand became officially recognized by the appearance of [[Olo]] pens in the parent company catalogs, as proposed as lower end pens, but with the usual characteristics of reliability and robustness.  

This changed only after the mid '30s, when the role of [[Aurora]] sub-brand became officially recognized by the appearance of [[Olo]] pens in the parent company catalogs, as proposed as lower end pens, but with the usual characteristics of reliability and robustness.  

There is no precise dating of the [[Olo]] models, although usually you can take as a reference the corresponding modelsof the [[Aurora]] production of which they were a kind of cheap version; they are easily recognizable by clips shapes and materials entirely similar to those of the respective [[Aurora]] models.

There is no precise dating of the [[Olo]] models, although usually you can take as a reference the corresponding models of the [[Aurora]] production of which they were a kind of cheap version; they are easily recognizable by clips shapes and materials entirely similar to those of the respective [[Aurora]] models.

First [[Olo]] models were safeties similar to [[R.A.|R.A.3]]  (with clip) and  [[R.A.|R.A.0]] (with ring), however, marked with the [[Olo]] logo (an ellipsoid squared with the ''OLO'' inscription inside) both on the nib and on the pen body and on the cap top. These were produced also in laminated gold [[overlay]]s (marked ''18 KR'') always in the two previous measures, respectively called ''Type 3'' and ''Type 0'', and with two filling systems: [[safety]] and [[button filler]], the latter resumed shapes and clip of the [[A.R.A.|A.R.A. 15]], even if the decorations used for the [[overlay]] are different from those of the [[Aurora]] models.

First [[Olo]] models were safeties similar to [[R.A.|R.A.3]]  (with clip) and  [[R.A.|R.A.0]] (with ring), however, marked with the [[Olo]] logo (an ellipsoid squared with the ''OLO'' inscription inside) both on the nib and on the pen body and on the cap top. These were produced also in laminated gold [[overlay]]s (marked ''18 KR'') always in the two previous measures, respectively called ''Type 3'' and ''Type 0'', and with two filling systems: [[safety]] and [[button filler]], the latter resumed shapes and clip of the [[A.R.A.|A.R.A. 15]], even if the decorations used for the [[overlay]] are different from those of the [[Aurora]] models.

Following the changes in the [[Aurora]] production alsothe [[Olo]] models were renewed in the first half of the '30s, with the introduction of the [[Olo Lusso]], produced in two sizes, large and medium, with the same clip of [[Superna]] attached to the cap with a metal head with a dowel screw. The pen was made of celluloid machined from solid barrel in the same marbled and crossed lines colors of the [[Aurora]] models of the same period and was produced with chrome and golden trim. The ''OLO'' logo was reported or on section or on the body.  

Following the changes in the [[Aurora]] production alsothe [[Olo]] models were renewed in the first half of the '30s, with the introduction of the [[Olo Lusso]], produced in two sizes, large and medium, with the same clip of [[Superna]] attached to the cap with a metal head with a dowel screw. The pen was made of celluloid machined from solid barrel in the same marbled and crossed lines colors of the [[Aurora]] models of the same period and was produced with chrome and golden trim. The ''OLO'' logo was reported or on section or on the body.  

Nella seconda metà degli anni '30 vennero poi introdotti i modelli [[Olo F]] ed [[Olo Gamma]], la prima era una penna sfaccettata, che si rifaceva all'analoga versione della [[Novum]]. La seconda era una penna di linee più diritte, con un fondello con una copertura di metallo. Entrambe prevedevano l'abbinamento di matite meccaniche.  

In the second half of the '30s were then introduced the [[Olo F]] and [[Olo Gamma]] models, the first was a faceted pen, going back to the similar [[Novum]] model. The second was a pen with straightest lines, with a metal cover bottom. Both were offered with combination of mechanical pencils.  

In the '40s the production was revised, and a new jagged clip was used, not present on [[Aurora]] marked models, but used by the company in other economic production. Moreover, with the introduction in 1938 of ''[[Platiridio]]'' nibs, also [[Olo]] pens were mounted with steel or gold plated steel nibs, marked ''OLO'', which were imprinted in addition to the squared ellipsoid logo also with the production year.

In the '40s the production was revised, and a new jagged clip was used, not present on [[Aurora]] marked models, but used by the company in other economic production. Moreover, with the introduction in 1938 of ''[[Platiridio]]'' nibs, also [[Olo]] pens were mounted with steel or gold plated steel nibs, marked ''OLO'', which were imprinted in addition to the squared ellipsoid logo also with the production year.

In this 1941 [[:File:Aurora-Invoice-1941-10.jpg|invoice]], is mentioned a model called [[Olo Flexor]], produced at least in large and medium sizes. It is not clear to which model it refers.

In this 1941 [[:File:1941-10-Aurora-Invoice.jpg|invoice]], is mentioned a model called [[Olo Flexor]], produced at least in large and medium sizes. It is not clear to which model it refers. But on a page of a 1940 [[Aurora]] catalog published in the Letizia Jacopini book  there is a ''[[Flexor]]'' pen with a ''"Flexor"'' imprinted nib, next to a very similar [[Atena]] pen. And both have a clip that is substantially identical to the one found on some versions of the [[Summit]] [[Summit serie S.|S. serie]].  

The production of fountain pens branded [[Olo]] was essentially abandoned after the war.

The production of fountain pens branded [[Olo]] was essentially abandoned after the war.

===Notes===

===Notes===

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