QUOTE (Vicary @ Jun 15 2008, 07:47 PM)

The blue and green Optimas, as well as the earlier LE pens are Cellulose Acetate. The newer burgundy marble is resin.
I noticed on a recent trip to Bertram's that Aurora has switched to a slightly different variant in the blue marbled material. The blue now seems much brighter than before, and it's in a field of blue-violet, whereas the older color used a darker blue-black as the main color, with flakes of deeper but darker blue. So I'm not sure about the newer blue material....
Fwiw, I just got a used Optima (Green), and it definitely seems like resin. Qualitatively, it feels like the Mare and the Minima Fuoco, and it does not feel like the cellulose acetate I've got on a number of pens (e.g., Stipula and Retro 51). Let's just say none of the Auroras pass the
"scroop" test, which, imho, makes Stipula even more of a value leader in the Italian gold-nibbed piston filler market.
As an example (prices yanked from Swisher):
Aurora Optima Blue, Piston Filler, Resin (?), 14k nib: list $625, street $469
Stipula Etruria Ambra, Piston Filler, Cellulose Acetate, 18k nib: list $590, street $443
Edited to add: my used Optima is quite new vintage: it has the new cap design (where the greek keys do not go all the way around).