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Yep! That is a lefty, the flat is on the inside of the body when using it!I don't know kanji but that is a left-handed deba.
I did a little research on your kanji letters. The first two are "betsu da" meaning "specially forged" "別 打".
The last two are "友 沢" which is tomo sawa / tomozawa / tomizawa, which may be a person, company or place name.
The complex one in the middle looks like 隷, "rei" which means :"slave" as a standalone word. I may not have gotten that one right, it is a complicated symbol.
I don't speak or read Japanese, that's just from doing some Google searching of the characters.