This is a Parker 75 medium stub ciselé of around 1968-1971.
The line thickness it produces is about 0.9 mm in width. This width is comfortable for writing characters of medium size (see also the writing comparison). The pen’s triangular section is thin, but it is very comfortable to hold. The pen as a whole is on the smaller side, but the nib is big. Since the pen is of some vintage it is a stub proper rather than cursive italic, i.e. the tipping is noticeably thick with the writing edge noticeably but not drastically rounded (see schematic). The side edges are not rounded so as to be visible with the naked eye; the Artpen is also like that whereas the bottom of the Dostoevsky’s tipping has no corners but only smooth curves. It will not tear paper however. All three pens are extremely forgiving with the Artpen being the one most able to be held entirely carefree as if it did not have a broad edge.
The 75’s stub nib does not like very much smooth paper, either of the good (Rhodia) or of the cheaper (many modern notepads) variety. On Rhodia the 75 stub flies off the paper surface, often leaving no ink behind. Skipping on downstrokes is usual when writing at my usual speed, which is rather fast. By comparison, the Artpen iceskates on Rhodia leaving a thin film on ink behind and the Dostoevsky swims in its own ink. On school notebooks and on paper with cotton content the stub 75 performs consistently without problems and is definitely wet (the Dostoevsky and the Duofold are wetter, as can be seen on the comparison sheet).
Some closeups of the nib:
The pen feels light but with a perceptible substance in the hand.
Overall, this is a gorgeous pen allowing some very expressive writing.