The nib is stamped 18k (pink color), and the rest is gold, but there are no other markings. Also, when viewed with a magnifying glass, there is one large nib with a platinum-like color and eight small nibs, for a total of nine. The small nibs are stamped with "1953," so I think these nibs were made 72 years ago, in 1953 (Showa 28). I'm not sure if they can be used, so I'm selling them as vintage junk items. Please judge from the pictures.