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.
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 age is. I know he lived well after the war ended, but I don't know if he was still creating after the war. I'd love to hear anything you guys may know or can glean from the pictures! I think its a fairly gorgeous blade, despite not being made entirely traditionally!
P.S. As for the pictures, I did not take them. The seller did! There are small scratches here and there, but thankfully nothing that detracts from it seriously.