This is a pre-owned Aurora Optima Nebulosa Limited Edition Fountain Pen 18k Fine Nib that comes to the shop without box/papers.  This is #83/88.

The Aurora Optima Nebulosa is a highly sought-after, limited-edition fountain pen featuring a distinct purple marbled "Auroloide" celluloid body, typically accented with chrome trim. Released around 2017-2018 as a US exclusive, it features an 18k gold nib and a high-capacity piston filling system with a hidden ink reserve.