I have an OMAS 1930. This is a small pen (I like small pens

), so I hope it lives up to your expectations.
It is the same size as the
Montblanc Meisterstuck 114 Mozart
Montegrappa Micra
Visconti Viscontina
But from these 4 it is the only pistonfiller.
It is a scaled down version of the Paragon, right up to the ebonite feed.
It has a very good performance, but the difference with the Paragon is that the nib is not as flexible, probably due to its smaller size.
Here is are 2 quick pics:
Click to view attachmentClick to view attachment