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Check this out from Fikira, its a great read.

https://www.google.com/amp/s/historyrazors.wordpress.com/2016/12/08/iwasaki/amp/

I believe the M relates to medium hardness.

Very nice Phrank, those kamis in scales were made by Kosuke Iwasaki, Shigeyoshis father.

I cant see it that well but if its 登録 it means registered which is on some Iwasakis

Ive seen that kanji on the earlier Iwasakis. I cant remember what it means though...it will be the modified Swedish steel. Congratulations it will be a fine shaver.

This is the kanji for Tamahagane 玉鋼 Phrank