I traded for this Nagoya made T-99 several years ago to complement my T-14 Nagoya Nambu. The bayonet came along a little later off eBay.
No dust cover or mum; . . .
. . . no "anti-aircraft arms" on the rear sight; . . .
. . . and no mono-pod or cleaning rod.
The markings on the receiver indicate that it is a Sixth Series S/N 19508 made by the Nagoya Arsenal. The serial number would
seem to place it somewhere in the middle of the production run for the T-99s manufactured at Nagoya between 1939 and 1945.
The last three digits of the serial number (508) are on the bottom of the bolt shank . . .
. . . and the bayonet lug on the forend of the rifle.
The bayonet is a Type 30 with a straight contoured crossguard, contoured screw-retained grips and a contoured birdshead pommel. The blade is blued with fullers and unsharpened. According to the markings on the blade it was made by Toyoda Jidoshoki Seisakusho (Toyoda Automatic Loom Works) under Nagoya supervision.
I haven't found any other numbered parts and I'm curious to know if this rifle would be considered all "matching" with the receiver, bolt and bayonet lug numbers matching. I am also unsure if the missing dust cover, anti-aircraft sight arms, mono-pod and cleaning rod was common on the Type 99s produced at Nagoya later in the war. Any info would be appreciated.