This Japanese manufactured complete rear sight assembly is for the Type 99 Arisaka bolt action rifle in 7.7 caliber and is in very good condition exhibiting a mixture of thinning original blue finish with a brown patina. The spring screw is missing. The rear sight slide lacks the option for the aircraft arms.  (file photo)

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

Nagoya Arsenal: 40856