That description fits the Montblanc “Turbo” of the 1970s, a plain school and everyday pen. Its hallmarks are the cap and the rear part of the barrel in brushed aluminium, the star on a hemispherical plastic mount at both ends, an unshaped clip of round wire ending in a plastic ball, and a stainless steel nib. The Turbo took standard cartridges, and an ordinary converter could be fitted as an alternative. The weak point in the design is the joint between section and barrel: the plastic thread of the section screws into the metal part and strips easily if the pen is opened often, which is why faulty examples are common.
Models of this kind are explained by the company's history. Until around 1991 Montblanc covered the entire range from the very cheapest school pen up to the Meisterstück, and only then positioned itself exclusively as a maker of high-quality writing instruments. A Turbo is accordingly not a Meisterstück and never bore comparison with one, whether in material, nib or finish. On the second-hand market these mass-produced models are correspondingly cheap. Even simple 1970s models with a gold nib, a 121 for instance, were changing hands for around 20 euros in 2011, so that a replacement in good condition is usually a better bet than a repair.