This is from the Showa era. The manufacturer is unknown, but I've made it usable as much as possible. It's suitable for writing characters slowly and carefully, with the fountain pen tilted at about a 40-degree angle. It's not suitable for those who press hard when writing. The sac was worn out, so it has been replaced with a new one. I've been using it with Pilot Iroshizuku ink. It's been almost two years, and it has a retro feel, which is very nice. The ink, which I refilled last month, still has a little left. It can be used as is, but it is very old. This is for those who understand and are able to do some maintenance.