Thank you for your information. It is very excited indeed. It is my first antique Japanese pieces.
I tired to take off the barrel but fail. It seem like it stuck ( I removed the 4 pin along the wood stock, then try to push out the barrel but nothing move)
Is there other pin else where I need to remove? (I follow all the instructions on how to removed in thr FAQ question on this forum but still no luck) or just the 4 pin and push out the barrel harder?
Congratulations on your new acquisition. You must be very excited.
It would be foolish of me to say anything before you post pictures of the signature, if there is one, but your gun has most of the signs of a small bore long gun from Settsu/Sesshu/Sakai (Osaka). What are generally called merchants' guns. They are around 1 or 2 Monme in caliber, and they tend to be flashily decorated like yours. The tear shaped trigger, the shape of the rear sight, the thick brass breech band, the inlay on the barrel and the brass decorations on the stock all point that way. Your gun will be needing a new pan cover, and possibly a trigger guard?
These are all (un)helpful guesses. Now watch me get egg on my face.