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Jaymo Replacement for Cross 8518-6 and Schmidt 635 - Measures 2.625 in / 67 mm Long - D (D1) Standard Multifunction Mini Ballpoint Pen Refill - 6 Blue - Walmart.com
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Schmidt Mine Refill D1 635 mini Swarovski Compatible Ballpoint Pen with END CAPS | eBay
Kaweco Soul D1 Ballpoint Pen Refill - 1.2 mm - Blue - Pack of 5 | JetPens
Faber-Castell D1 Mini Ballpoint Pen Refill in Blue - Goldspot Pens