yes, that is what I meant, the DolceVita line involved several different models from the start (size variants, Soire' finish, etc) but there was a strong correlation in materials and finishes that would distinguish the pens as Dolce Vita range.
Many of the LE editions that followed were then tied to collaborations with Distributors and pen shops, like the Blue Jay, the Mezza Notte, the Chatterley models. The Gallery was quite a nice own Delta LE based on the Dolce Vita especially in the black caps and finial versions.
(I personally dislike the masterpiece, and I am not quite sure whether this is still a 100% Delta design/idea)
The following MM modifications however, with an infinite range of different colours of body and barrel just loses that Dolce Vita feeling.
As long as they could fit delta niibs on them they would still be good writers. Then that stopped too...
That's how I read it anyway, but anyone is free to disagree.
To clarify about Leonardo, as far as I know, both the dark blue celluloid Momento zero (together with a new lighter blue Mediterraneo celluloid version) and the ebonite version are not exclusive to Corsani.
They are the LE versions on offer by Leonardo, together with other resin versions, (steel nib)
the numbered version resin
– Horn resin (rhodium plated trim)
– Positano blue resin (swirl) (gold plated trim)
– matt black (gun metal trim, reuthenium plated).
and the "ordinary" resin
– deep blue
– red marble
– brown vintage
And these can also be found in other shops (goldpen, casa della stilografica, etc)
the one specific resin which is exclusive to Corsani is the blue striped version (and this version uses the same resin as was used for the Delta Blue jay)
i.e. this one