| Model | Noblesse Blue Marbled 18240 |
| Ident No. | – |
| Writing System | |
| Writing System | Ballpoint Pen with twist mechanism |
| Nib | – |
| Features | |
| Barrel | Marbled in Noblesse lacquer in blue |
| Cap | Blue marbled |
| Trim | Gold-plated rings embossed with Montblanc brand name |
| Clip | Gold-plated clip |
| Special Characteristics | – |
The Noblesse Oblige line was launched a few years after the Noblesse 3rd Generation and both lines of pens continued to be market simultaneously. As Montblanc placed its latest generation Noblesse in a higher price bracket, the Noblesse Oblige came to fill the gap previously occupied by the cheaper 2nd Generation Noblesse and SlimLine ranges. Eventually, the Noblesse ranges were discontinued upon the introduction of the Boheme line.
The Noblesse Oblige was made in a number of solid colours in an acrylic body. The trim was usually gold-plated, although a few versions were also made with platinum-plated trim. The available colours were: black, navy blue, burgundy, dark green, olive green, baby blue, yellow, cream, greyish blue, and violet.