Montblanc - Sans prix de réserve - Stylo

This is the Montblanc Writers Edition Alexandre Dumas (specifically the ballpoint pen version from the 1996 Limited Edition series).
​Key features visible in the image include:
​Design & Materials: A combination of a dark brown/black precious resin cap and a shimmering, marbled grey-and-white barrel made to resemble tortoiseshell (which was a hallmark of the 1996 Dumas edition).
​Gold Plating: Gold-plated trim, ring accents, and clip.
​Signature: Alexandre Dumas’s distinctive signature is engraved on the cap.