A typical example is the following pen by Ryo. Not much is known about this company. It was located in Nakano, Tokyo, and belonged to a company named Otani.
The decoration on the section is limited to the upper part. This picture corresponds to the Ryo Ultra with gold-plated steel nib.
This Ryo pen is equipped with a 14 K gold nib, quite springy, that is partially hidden inside the section. And this is decorated with a gold-plated damascene in the shape of the Pilot Super Ultra inlaid nib. This decoration, however, is limited to the upper part of the section. The filling system of the pen is aerometric. Its overall quality is quite high. These are its dimensions:
Length closed: 136 mm
Length open: 123 mm
Length posted: 154 mm
Diameter: 11 mm
Weight (dry): 14.3 mm
Ink deposit: 0.8 ml.
Its original price was JPY 1000, in sharp contrast with the JPY 5000 of the Pilot original. Ryo also marketed another version with a gold plated steel nib.
All in all, these are interesting pens. They show the existence of an active pen industry around 1960s struggling in a very competitive market.