Parker 25 with black trim - M nib

A picture of the 'M' that is incised/stamped on the underside of the feed of my Parker 25 that has black plastic trim.

The presence of this 'M' makes me think that this grip-section & nib is a replacement unit of far more recent construction than the body & cap of this pen, which date from 1976-1978.

I got this Parker 25 with black trim as a 'partner' for my Parker 25 that has blue trim.
I like the 25 for its robust construction and 'no-nonsense' utilitarian design ethos. Its ugly 1970s-'futuristic' design also triggers nostalgia in me.

I am happy to report that the pen is in great condition (even the logo on the clip looks minty), and that it writes really nicely.