Number 6 series Type 99,82,000 range what year ???

I think mid war 6th series Nagoya ,but what year,chrome bore,finger groove stock ,long site,no AA sites or monopod.Thanks After reading sites I am thinking last 1/4 of 1943 to first 1/4 of 1944. What do you think arisaka guru,s, best thanks learning starting Japanese collecter.

Updated rifle info it was incomplete,thanks.

Dec. 1943 ± a month