sought-after ! Extremely rare & extremely lovely vintage Montblanc, name unknown, ballpoint pen

This is a ballpoint pen with a Montblanc hammer trigger mechanism. It was sold for a really short period as a set with the Montblanc 2209 fountain pen. While models with a resin lower barrel are common, the every-metal, chrome-plated model is considered a rare item, even on overseas websites where its name is unknown.

Functionality has been confirmed.
A refill adapter and a black refill are included.

Search terms:
Parker, Sheaffer, Conklin, Faber-Castell, Rotring, 38, 28, 18, pix, 15, 25, 35, 16, 26, 36, 0.92, 1.18, mechanical pencil, sharp pen, sharp pencil, fountain pen, pix o mat, Pilot, discontinued, Caran d'Ache, Ecridor, 142, 144, 145, 146, 147, 149, silver, maki-e