This fountain pen is made with 'Kirigane' a technique using real gold leaf.

Whta is Kirikane?
Kirikane was introduced to Japan in the 6th century through Buddhism. It is a traditional Japanese technique using gold, silver or platinum leaf, which is then cut into thin strips and applied as patterns using a brush and special glue(Nikawa)
It was developed as a technique for Buddhist art decoration (statues and paintings), and it is now used in Japan, mainly in Kyoto to decorate special art and craft materials.

Koufu (red maple)
Koufu (red maple leaf) is a pattern that represents change, as the leaves change color.
It also has the meaning of success in life, as the shape of the leaves resembles a rooster's crest.