This Japanese manufactured bayonet housing mounting screw is for the Type 44 Arisaka bolt action carbine in 6.5 caliber and is in very good condition exhibiting a brownish gray patina with slot wear. (file photo)
Note: Japanese Type 44 Arisaka bolt action carbines with the following arsenals and serial numbers have been observed with this part:
Koishikawa / Kokura: 019478 & 47028