Schmidt K5 converter suitable for most fountain pens.
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I bought this to replace the ones in my Jinhao x750 and x450; it fits with a little more push. Can guarantee it works for both pens.
Good quality converter. Stated capacity is .7mL. I used in my Pelikan Pelikano Jr., it's a perfect fit. Just wish it were cheaper here, as on JetPens and other sites it's 5USD.