Modifiche

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.

[[Image:Olo-Blue-FIAT-Capped.jpg|thumb|A ''Olo'' FIAT advertizing model]]

[[Image:Olo-Blue-FIAT-Capped.jpg|thumb|A [[Olo]] FIAT advertizing model]]

These first pens were followed by ''[[Flat top]]''  models, very similar to [[Parker]] [[Duofold]], also produced in two sizes and in black and colored celluloid. These pens are characterized by a rather large metal ring on the cap and the ''OLO'' logo engraved both on the body near the bottom of the pen and on the nib section. These models were created in parallel to the introduction of the [[Duplex]] for which can be considered the economic version.

These first pens were followed by ''[[Flat top]]''  models, very similar to [[Parker]] [[Duofold]], also produced in two sizes and in black and colored celluloid. These pens are characterized by a rather large metal ring on the cap and the ''OLO'' logo engraved both on the body near the bottom of the pen and on the nib section. These models were created in parallel to the introduction of the [[Duplex]] for which can be considered the economic version.