Here are my three Rotring Core pens. The orange one in the middle is the new addition. I don't think these are made anymore and one should be in your collection. I am using international refills in two of them and a Cross roller ball refill in the new one. I am also getting a ball point pen to add to my collection. The Rotring Cores also have a fountain pen which I would think is more popular.
Don't know if I could get used to the bulk of the body on these. Their design is appealing, however.
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