Recommended Reading on the "W" or Double Chevron stamp: The Mysterious "w" Stamp! - Military Swords of Japan - Nihonto Message Board, well known in the sword community. Found on other weapons and equipment as well. Our treasured Nick Komiya uncovered the regulation showing the stamp to be a intermediate/half-way inspection stamp. I personally have 3 Type 95s with it on the nakago.
As to number stamping, they were not "machine applied". It is more common to see them misaligned that all straight and perfect. I guarantee you the blade is legit.
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