Montblanc - Bolígrafo con soporte de escritorio modelo de exhibición de tienda - años 50

I am selling this demonstration/display model for a pen with desk stand from the 1950's. These were used in stores to display possible models that could be ordered. It is labeled as such by an engraving saying "Unverkäuflich" meaning not to be sold. It is overall in good condition but it is missing a piece of plastic on the front left corner (see photos).

To be very clear, this is not a working pen. It should be treated as a decorative item.

This auction will start without a reserve price, please examine the photos before bidding.