Hello pen experts. I have this fountain pen that I need your expert knowledge to help me identify with the year, model and if possible, the value. The pen's body has the engraving, "Caran D'Ache Gold Plated G" - Not sure what G means. The nib says 18C - 750 B - Not sure what 750 or B mean. The nib also has a number engraved inside above the screw 255816 - Not sure what this number is. http://i.imgur.com/ekXU4R8.jpg http://i.imgur.com/WExpnxE.jpg http://i.imgur.com/6Z3BYhX.jpg http://i.imgur.com/UwvMaJm.jpg http://i.imgur.com/cRvR3l9.jpg http://i.imgur.com/idw0v6u.jpg http://i.imgur.com/7gHoGPS.jpg Thanks Hossam