Hey all!
I picked up this number with another katana about a week ago. After looking at ohmura (http://ohmura-study.net/212.html), I believe this to be "anti-rust gunto," the kind made with chromium alloyed steel during the wartime. I think this one is signed Takeyasu.
Some measurements:
Nagasa: 64.5 cm. Sori: 1.7 cm.
Moto-haba: 3.3 cm. Saki-haba: 2.5 cm.
Moto-gasane: 0.8 cm. Saki-gasane: 0.6 cm.
Please let me know if my assumptions are correct and what the probable