I have a Parker pen which was given to me sometimes in the 1970's. As I recall, it came with a felt tip style cartridge, which I never much cared for. I later replaced it with a Parker roller ball cartridge. It fit okay, but didn't seem to be made for this pen. As you can see in the photo, its tip is smaller than the end of the barrel. The original cartridge had a closer fit. I'm relating this from my memory of nearly 50 years ago, so I might be mistaken, but this is what I recall. Looking on eBay, I don't see any roller ball Parker's with a removable cap like this one. . . . those are all fountain pens. Any information you can provide me about this pen would be greatly appreciated. Also, information on the best refill for this pen would be great as well.

Thanks!

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