Such unusual 149s are mostly own constructions of skilled collectors or pieces reworked by third-party providers like Paul Rossi and were not officially delivered by Montblanc. The motive is often the restoration of damaged body parts or a pure refinement, e.g. with maki-e or gemstone overlays after the historical model of the jeweller's overlays. Such reworkings can significantly increase the market value, sometimes by triple or more. Important, however, is correct declaration as a special production, not as an original Montblanc.