The second sword is a WW II Japanese Army NCO shingunto - all are machine made. The serial numbers are just manufacturing numbers, not assignment numbers to a soldier; so there is no way to trace to whom the sword belonged. An interesting war relic, but not a handmade sword that Nihonto collectors would be interested in. See here - look under military swords.
Rich
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Richard Stein, PhD
Japanese Sword Guide
http://japaneseswordindex.com/nihonto.htm