A Cestrian, in case you didn’t know (I didn’t) is an occupant of the city of Chester. Phillipson & Golder were (and may still be, for all I know) a large and successful printing and publishing business in Chester, turning out books, many related to the area, directories, maps, prints and an almost endless list of other things.
They also sold – or maybe gave away as a promotion – the Cestrian pen.
We don’t have to hunt for clues as to who actually made it; Thomas De La Rue’s logo is on the clip.
It’s a well-made pen in a plain way. Its only notable features are the quite short filling lever and the peaked clip screw.
I have nothing to date it by, but going on the style alone I would suggest that it’s a post-war pen.