Unknown model

The logo on this one is as the logo on unknown model no. 1, which is probably a Matsumoku guitar. The same logo is featured on the acoustic guitars which were made by Matsumoku in the 1970s. The model name is '501' and it was bought in December 1980. The guitar has been examined by a luthier and the construction is apparently:

Thanks to Fernando Freitez for the pictures and detailed information