So I picked up a Katana mounted in WWII Type 94 Koshirae, I got curious on the blade itself and I need help putting a rough date on the blade. It is a mumei, so unsigned. I'm sure the blade itself dates before WWII, it has the steel grain, Hada, and a Hamon line. Is there any way to date this? The Hamon is very difficult to see, I assume it was mistreated in the past. Sorry, this is my first post so m still fairly unfamiliar with the site.