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With the progress of the war raw materials began to be scarce and in particular gold for nibs, as the majority of European companies [[OMAS]] had to resort to some steel alloy, that the company renamed ''[[Permanio]]'', that was declared to be better even than gold. In fact just this alloy proved to be one of the most susceptible to corrosion, so that today ''[[Permanio]]'' nibs are rare and have a much higher value of their analogues in gold.
With the progress of the war raw materials began to be scarce and in particular gold for nibs, as the majority of European companies [[OMAS]] had to resort to some steel alloy, that the company renamed ''[[Permanio]]'', that was declared to be better even than gold. In fact just this alloy proved to be one of the most susceptible to corrosion, so that today ''[[Permanio]]'' nibs are rare and have a much higher value of their analogues in gold.
After the war production resumed with new ogival pens and the transition to [[piston filler]]. In [[1946]] the [[Omas Extra|Extra]] line was completely restyled, the wheel clip was maintained but were used three rings on the cap. Also the [[piston filler]] was adopted and a transparent section for viewing ink level was introduced. Three sizes were maintained: small, medium and large, identified respectively with the numbers [[Omas 55x|555]], [[Omas 55x|556]] and [[Omas 55x|557]].
After the war production resumed with new ogival pens and the transition to [[piston filler]]. In 1946 the [[Omas Extra|Extra]] line was completely restyled, the wheel clip was maintained but were used three rings on the cap. Also the [[piston filler]] was adopted and a transparent section for viewing ink level was introduced. Three sizes were maintained: small, medium and large, identified respectively with the numbers [[Omas 55x|555]], [[Omas 55x|556]] and [[Omas 55x|557]].
[[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]] ]]