Would be better to get some clearer photos. The one on the right says
昭和十八年一月 (Shōwa 18 nen ichi gatsu) = January, 1943
After that it is illegible to me.
The photo on the right says 山田囗囗 (Yamada-something something) Presumably the name of the smith.
I'd be interested to know if there are any other markings, or any stamps above the hole in the tang.