About This Pen: This Montblanc Solitaire M23787 Pen has a piston fountain pen writing system. It features a black precious resin barrel with barley guilloche pattern, complemented by a 925 sterling silver cap with barley guilloche pattern. Both clip and fittings are platinum-plated. The three platinum-plated rings on the cap is embossed with the Montblanc brand name. The nib is made out of 18K gold with rhodium-plated inlay and is hand-crafted by Montblanc. The following Nib Width are available: Identification No. Nib Widths 104537 | 105215 F 104548 | 105216 M