Just a bit of history as both brothers have passed. They were a formidable pair and worked well together and apart.
"HIROSHI TAMURA
Just like many other famous Japanese luthiers of that era, Hiroshi and Mitsuru Tamura have learned their craft during their stay in Spain in late 1950s/early 1960s. After their return from Spain Tamura brothers were making superb quality flamenco guitars that easily challenged guitars made by the most famous Spanish luthiers. Their flamenco guitars have earned them international recognition and were played by many professional players. Strangely enough, their oldest classical guitars available on Japanese second hand market were made in 1966.
It is quite possible that, during 1960s, both brothers shared the same workshop located in Kochi, Japan. Although both brothers were equally skilled, it was Hiroshi who has gathered more international and domestic rewards. Because his guitars often sounded much better that those made Jose Ramirez, Hiroshi has earned a nickname “Tamirez” As the matter of fact, Hiroshi’s rewards outnumbered those collected by Masaru Kohno.
In 1972 Hiroshi was financially rewarded by Japanese Ministry of Technology. Soon after, he moved to another shop, but not far from his brother’s, hired several associates and started to make his P and C models in greater numbers, successfully exporting many them outside Japan. Only the very top models Hiroshi was making by himself.
Mitsuru Tamura has continued to work as individual luthier, and with just couple of apprentices, was making about 15-20 guitars a month. As the result Mitsuru’s guitars are harder to find on Japanese second hand market and they often reach higher prices than guitars made by Hiroshi.
Sometime in 1976, after his “factory” started to produce financial losses, Hiroshi had to declare bankruptcy and moved back to smaller workshop, making fewer number of guitar with just couple of helpers.
Tamura brothers passed away in mid 1980s. Because I have seen one Hiroshi's guitar made in 1986. I assume it was the last year of his "Earthly Journey". Just like in case of their superb flamenco guitars, classical guitars made by Tamura brothers are equally regarded in Japan."