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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: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. 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]].