This Japanese manufactured first variation complete bolt assembly with the straight bolt handle, plum shaped knob, .495" long extractor and checkered safety is for the early Type 99 Arisaka bolt action rifle in 7.7 caliber and is in good condition exhibiting a mixture of thinning original blue finish with a brownish gray patina with containing some rust and light wear. (file photo)

Note: Japanese Type 99 Arisaka bolt action rifles with the following arsenals and / or serial numbers have been observed with this part: 16866 & 21908