Dave and PS both have good advice. At the top of this forum, there is a sticky on markings. That will help you identify what you are looking at.
The Type 99 rifle was made by from 1940 to 1945 by eight different arsenals. Nagoya and Kokura being the most prolific.
Each arsenal was assigned a group of "series numbers" in groups of 100,000 each. The serial numbers are repeated for each series. For example, Nagoya had series 0 (no series mark) through 12, so the same serial number was repeated 13 times.
With a few exceptions (matched by assembly number) Type 99 rifles were matched by the last three numbers of the serial number on the left side of the receiver, on the bolt and front band, (and a couple of other places).
In selecting a rifle, my first criteria would be matching numbers, followed by original finish (Bubba got to some of them), then "Mum".
As the war progressed, features such as monopod, dust cover and anti-aircraft wings were omitted. Beware of reproductions. There is one vendor in New York who is known to swap stocks, add features, and change serial numbers to match, to enhance the price.
Good luck!
Last edited by Deano41; 02-09-2014 at 11:20.
Dean (the other one)
OFC-Orange Co. Ca Chapter