If this Waterman had been made in America or Canada it would have a model name. English-made ones just have a number: 877. Anything of the Taperite kind has a reputation for being difficult to repair. Specifically, they are said to be hard to do disassemble. Actually that is only true of the US ones. Those have sections glued into the barrel and the one or two of them I have had would have counted as one of the labours of Hercules.
This one has a dark green barrel and section and a gold and silver coloured aluminium cap. Despite a couple of dings in the cap it’s in good condition. The clutch closes the pen very firmly and the clip only shows wear at the tip. The box lever is in lovely condition.
Though these pens show some resemblance to the Parker 51 in the partially covered nib and long section, many of these nibs have at least some flexibility, something lacking in the 51. The semi-hooded nib of the Parker 45 is rather like this Waterman nib.
These pens are not especially popular, partly from the mistaken belief that there are hard to repair but also because many of them have not survived well. Waterman gold plating of this period is notoriously poor. Often the caps are loose but that is easily repaired. Some have loose sections – a distinct contrast with the US variety – but again that isn’t an insoluble problem. A good example, like this one, is a very nice pen indeed. The designer, whoever he or she may have been, dared to create a new and different style, one that works well, in my opinion.
Goodwriterspens's Blog 
Deb. Strangely enough, I suspect what you may have there, going by the cap at least, is a Crusader !! And depending on whether the actual numbers 877 are on the barrel, maybe the corresponding crusader Taperite pen too ? .
These are a very nice and sturdily built pen overall, with the 877 and the Stateleigh usually having the ‘non-aluminium’ gold filled cap ( with one or two differing etched line configurations )
I have a few of these, in both glass cartridge and lever , and have played around with them a lot.
I haven’t yet come across one with any glued sections thank goodness, and the glass cartridge rubber boot problem is quite easy to fix in any of a few ways.
Given how often I’ve heard that there seem to be exceptions to many of the model designations and numbers, ( probably from you too !) it wouldn’t surprise me that yours had 877 imprinted on it and what is usually referred to as the Crusader cap,
Possibly there was a bit of a ‘grab bag’ attitude with regard to the caps (???) as I have mentioned before
I’m sure you would have seen this page on Richard Binder’s site….
http://www.richardspens.com/ref/profiles/taperite.htm
They are quality pens and some of their nibs are wonderfully semi flexible, ( which is icing on the cake for me….🤗)
Cheers 🙋🏻♂️
As I said in the very first sentence, it might have had one of those names if it was made in Canada or the USA but it wasn’t. It’s an 877. I even included the barrel imprint which says, “877.”
Deb, .. what I was just wondering, was why yours has the Crusader cap …
I have a couple of 877s, and they both have the rolled gold cap.
Rob
These things vary.