Last month, I received a Leonardo Officina Italian pen. This was a limited edition (10 made) in redwood ebonite with a 14 kt gold stub nib. It is a piston loader. I posted a detailed review of that pen. (http://www.fountainp...e/#entry4029696) I liked it so much I bought another, but one of the "numbered" (not "limited") editions. This review will be less detailed, emphasizing the differences.
Numbered Edition above, Limited edition below
Numbered Edition, uncapped
The size and form of these pens is exactly the same. The quality of fit and finish is the same also, as far as I can tell. However, the cap of the Numbered edition unscrews, revealing the end of a captive converter. The section also unscrews, giving access to the converter. As far as I can tell, the converter is not removable, at least not easily. It seems to be standard, good quality converter. Another significant difference is that the Limited edition comes with 14 kt. gold nib while the Numbered edition comes with a steel nib.
The Numbered edition comes in several materials - Positano (blue), a "Horn" resin and a black resin. I chose the pen in Positano. The photos I saw online made this material look very similar if not identical to the material Montegrappa used in their Modigliani limited edition writing instruments. Rods of this material are available to pen turners, and I had a custom binde made of this material for a Pelikan M600 by Shawn Newton. Putting that pen next to my new Leonardo shows they are almost (but not quite) identical.
Pelikan above, Leonardo below
As many of you know, my daily handwriting is in italic script, so most of my fountain pens have italic or stub nibs. I found one of the select few pen shops that carry Leonardo pens that had the model I wanted with a stub nib. This was a bit of a gamble for me, but I found it writes almost identically to the gold stub on my ebonite Limited edition Leonardo.
Bottom line: I find this to be a beautiful, well-made pen which is comfortable to use and writes beautifully. With a price that is about one fifth of the Limited edition, it is a real bargain, in my opinion.