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[[OMAS]] between the first Italian companies to switch to [[celluloid]] in the late '20s or early '30s, producing its fountain pens as well as in the classic colors like green jade or lapis lazuli and also interesting variation of marbled colors. Between the production of this time there are some celluloid pens, with cap and clip similar to that used in the previous [[Duofold]] imitations, but having instead tapered ends. These were probably born in the early '30s, following the establishment of the ''[[streamlined]]'' style, and only a couple of samples are known. More or less in this period can be traced back the production beginning of the [[Minerva]] branded pens, the only real [[OMAS]] sub-brand,<ref>there are many pens that are known as made by [[OMAS]] on behalf of other companies, often directly derived from [[Minerva]] models; between them there are productions for the [[Ercolessi]], the [[Saratoga]] or [[Scotland]] brands, and perhaps also the [[Nettuno Superba]], there are also attributions to [[OMAS]] for the production of some particular models, as the [[Itala]] and, almost certainly wrong, the [[Zerollo]], but the only pens marketed directly by the company and appearing in its catalogs are the [[Minerva]] ones.</ref> dedicated to the production of second-tier but not less than excellent quality.

[[OMAS]] between the first Italian companies to switch to [[celluloid]] in the late '20s or early '30s, producing its fountain pens as well as in the classic colors like green jade or lapis lazuli and also interesting variation of marbled colors. Between the production of this time there are some celluloid pens, with cap and clip similar to that used in the previous [[Duofold]] imitations, but having instead tapered ends. These were probably born in the early '30s, following the establishment of the ''[[streamlined]]'' style, and only a couple of samples are known. More or less in this period can be traced back the production beginning of the [[Minerva]] branded pens, the only real [[OMAS]] sub-brand,<ref>there are many pens that are known as made by [[OMAS]] on behalf of other companies, often directly derived from [[Minerva]] models; between them there are productions for the [[Ercolessi]], the [[Saratoga]] or [[Scotland]] brands, and perhaps also the [[Nettuno Superba]], there are also attributions to [[OMAS]] for the production of some particular models, as the [[Itala]] and, almost certainly wrong, the [[Zerollo]], but the only pens marketed directly by the company and appearing in its catalogs are the [[Minerva]] ones.</ref> dedicated to the production of second-tier but not less than excellent quality.

[[File:Omas-Extra-Band-ArcoGrey-Senior-Capped.jpg|right|thumb|An [[Omas Extra]] in [[arco]] celluloid]]

[[File:Omas-Extra-Band-ArcoGrey-OS-Capped.jpg|right|thumb|An [[Omas Extra]] in [[arco]] celluloid]]

The real turning point in the [[OMAS]] production happened in [[1932]], when it introduced what is was for several decades one of the top models of the company, the [[Omas Extra]], made of faceted celluloid, a  [[lever filler]] model with a very large cap band, decorated with a greek pattern. The pen was produced in four different sizes and launched with the slogan ''the creation of an artist and a scientist'', and it was accompanied by a very extensive advertising campaign.  

The real turning point in the [[OMAS]] production happened in [[1932]], when it introduced what is was for several decades one of the top models of the company, the [[Omas Extra]], made of faceted celluloid, a  [[lever filler]] model with a very large cap band, decorated with a greek pattern. The pen was produced in four different sizes and launched with the slogan ''the creation of an artist and a scientist'', and it was accompanied by a very extensive advertising campaign.  

[[Image:1959-Omas-361.jpg|left|thumb|200px|Advertising for an [[Omas 361|361]] ]]

[[Image:1959-Omas-361.jpg|left|thumb|200px|Advertising for an [[Omas 361|361]] ]]

In [[1948]] it was made what is perhaps the most significant invention in the Italian fountain pen production, the [[Omas 361|361]] model. Born as a response for the success of [[Parker 51]], the originality of the pen is in the central position of the nib, mounted on the axis of the pen, around which is placed an hood open by one side. Depending on the position of use of the pen, and in particular of the open side, the nib can be almost completely covered, resulting in a rigid nib, or left uncovered, allowing a flexible writing. A grading system suddenly very functional, so that it is told that the [[Parker]] tried several times to acquire the patent ({{Cite patent|US|2565667}}) from [[OMAS]].

Nel [[1948]] venne realizzata quella che è forse la più significativa invenzione nel mondo della stilografica italiana, il modello [[Omas 361|361]]. Nata in risposta al successo della [[Parker 51]], l'originalità della penna sta nella posizione centrale del pennino, montato sull'asse della penna, schermato da un guscio di copertura curvo conico aperto su un lato dal quale emerge il pennino. In questo modo a seconda del lato da cui si usa della penna il pennino può essere completamente coperto, e bloccato dal guscio, ottenendo una scrittura rigida, o completamente aperto e libero di piegarsi, consentendo una scrittura flessibile. Un sistema di gradazione del tratto molto funzionale, tanto che si narra che la stessa [[Parker]] tentò più volte di acquisire il brevetto ({{Cite patent|US|2565667}}) dalla [[OMAS]].

[[File:Omas-Models-GraySerie-Capped.jpg|thumb|A group of gray [[Omas]] pens]]

[[File:Omas-Models-GraySerie-Capped.jpg|thumb|A group of gray [[Omas]] pens]]