A "thank-you" to the OP for an interesting idea for a thread.
Whilst I am perhaps better known for Mabie Todd Mania, I do have a very strong soft spot for Croxleys; there seems to be very little information about this marque. As is well known, Croxleys were manufactured by the John Dickinson paper concern (of Croxley Green Hertfordshire) using plant acquired, I have been told, from Lang's of Liverpool. It is said that production lasted only a few years, from the late 1940s to the early 'fifties.
In that short time Croxley did produce various models; here's a snap of six I have here at present. Sadly I don't currently own one of the "torpedo" shaped pens which might have completed the picture.
The first pen I believe to be an early model; whilst it has the famous arrow filler lever, the clip looks very like a Lang's one apart from the C stamped on it. The next two are perhaps the best-known shape; Croxley offered plain black and a number of delightful marble materials. I have never seen a Croxley of this type in a plain solid colour. Pens three and four in the picture are distinguished by their wider cap bands - these are the only two thus equipped that I have seen and I am glad I have them. Lastly the pen on the right is called the Silvern Cap model. This one is a beautifully made button filler, with a bi-colour 14ct nib; for some reason the section, screw-fitted of course has a left-hand thread.
A Croxley is a high-quality product, being at least equal in my view say to a De La Rue or indeed any number of its contemporary competitors, my one criticism being that the nibs are slightly on the small side to be pleasingly in proportion to the substantial dimensions of the pen. Most nibs are usually semi-flexible and come in fine, medium and broad. I have never seen a stub on a Croxley. Incidentally the pen with the inscription (fourth from the left) has a delightful flexible nib making it a pleasure to use.
I would love to hear from anyone who has any information about this manufacturer.