In case you needed copy-pastable text, the label reads 武藤久子サンノ為ニ之ヲ製作 昭和四十五年八月 池田司. It would appear that somebody called Ikeda Tsukasa ran a guitar school at some point. If you search for 池田司 ギター (Ikeda Tsukasa guitar), you will get a video of a Russian youth playing Recuerdos de la Alhambra on nicovideo. The description says he was a pupil at Ikeda Tsukasa's school in Tokyo. You can also find a mention of another of Ikeda Tsukasa's pupils giving a concert at a church in Yodobashi, Tokyo. His name is Ikeda Hirori （池田宏里） so I guess they are related.
I have no proof that this guy ever made guitars although it would make sense if he were the same person as the luthier who made your guitar.
2017 Burguet 1A Spruce