Thank you very much for your help with my sword! I took an additional picture of the other side of the tang for you, though I'm not sure if will be helpful.
Hello Kiipu, thank you for your assistance! The diameter of the circle around the anchor is roughly 4 millimeters.
Hello! I posted about this sword on another website and it was recommended to post here. I've been told that it is a Toyokawa Naval Arsenal sword per the anchor mark and that it's from Inaba.
Could anyone confirm that, and possibly assist with translating any additional information?
https://imgur.com/a/bztfFr9