Visiting a Japanese blacksmith

Greetings!

As a part of my journey to Japan, I would like to visit an authentic Japanese blacksmith, specializing in nihonto, and first of all, the famous Katanas.
Being a backpacking university student, I don't look for a private "show", but for it is worth, I have the curiosity and respect (both as a fan and as an engineer) to spend at least a full day in such a place.

From a glance, there are a few places that maybe what I look for: Osafune, Seki, Okuizumo.

I would be grateful for a recommendation - either on the mentioned above, or other place.

ありがとう ございます,
Simon.

I recommend go to Osafune in Okayama, There are work shop. http://www.city.setouchi.lg.jp/token/

Bizen-Osafune Nihon-to training school accepts a "free" guide tour on Sat, Sun and public holiday only.
Make an advanced booking first(prior to one week).
http://www.osahune.com/cgi-bin/enquete/form0001.reg

address: 93 Osafune, Osafune-cho, Setouchi-shi, Okayama

Hour: 9:00-16:00(Lunch Break:12:00-13:00)

Curving Performance on live: 13:00-14:00(Sun and Public Holiday "ONLY")

Note: International visitors are welcome to join but the guide only speaks Japanese language.

The guide invites you to the display hall first and explain the history of nihon-to and the process of how to make nihon-to(approx 30 mins). Then invite you to Katana master work place(approx 45 mins). You can ask questions related to Katana process but Katana master only speaks Japanese language.

Drunken visitors are prohibited to join.

Photo can be taken but ask the guide first.

The tour may cancelled without a notice.

Thank You very much for the answers!