Type 99 manufacture date

[WNO1958]

The arsenal mark is Nagoya. There is no Kana (series number) so it is series 0. It was likely made in 1941 (google arisaka date manaufacture -images) and you will find a chart with dates of manufacture).

Walter

Information

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[vintage hunter]

The arsenal mark is Nagoya. There is no Kana (series number) so it is series 0. It was likely made in 1941 (google arisaka date manaufacture -images) and you will find a chart with dates of manufacture).

Walter

That's just what I did and came up with www.oldmilitarymarkings.com who's chart show that no-series Nagoya Type 99's were produced from 1939-1945 with a s/n range of 0-99999. The op's rifle has a 4 digit s/n in the 3xxx range so based on the information available it was almost certainly made in 1939.
When dealing with non dated Japanese items and a lack of detailed production records a best guess estimate based on a fairly consistent monthly or yearly production figures is about as close as one can come.