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Hello guys, I am the new guy here, this is my first post. So please bear with me :)
I got a question regarding the variation of signatures from the same smith.

Question 1: Most sword made by Bicchunokami Tachibana Yasuhiro comes with a chrysanthemum crest but also some don't. Why is that?

Question 2: What is the difference between a Bizen sword sign "Bishu Osafune Norimitsu" vs just "Norimitsu" ? Is the latter a kazuuchi sword or its out right fake?

Hello, I discovered this site while looking up information on three swords I recently collected which effectively jump started my collection into something that I am really proud to own.

I have however little knowledge of the vast number of swordsmiths that have spanned the history of Japan to make these remarkable pieces of weaponry. I'd like help identifying the history of these swords.

Sword 1: Showa era WWII Naval Officers sword. Theres what's been translated to a date on the other side and this is a picture of the signature. (first two attachments)