The two vertical lockpins, pinheads appearing on the spine of the long tapered butt, are the first and most obvious distinguishing features of a Tosa gun. The small butt-end may be cut flat. Other common features will come into focus.
(Somewhat similar in appearance to the Ogino-Ryu school of gunnery, which has a rounded small butt-end, but repeated viewing will show up the differences.)
These style of matchlock is only produced in the southern part of Shikoku. In modern times called Kochi-pref, during the Edo-period Tosa-han. A rugged place battered by the weather producing a special breed of people. The daimyos of Tosa worked hard during the Edo period to keep it´s traditional warrior values all the way to the very end of the samurai era. Something I feel you can, to some degree, observe in this gun with it´s "no fuss" fully functional look.
A heavy gun with a rather long and slender stock making it tad top heavy. I would guess firing it with some kind of support would be most comfortable and resulting in more accurate aiming. Normally comes with a front and back sight but there is also examples which carries an extra middle sight.
Most striking is the two veritcal pins that holds the lock in place compared to all other models where the pins goes in from the side. The reason for this is not known to me. But it seems to work just fine and it leaves the big side plate clean. The hammer is made from iron with a copper inlay where the matchlock is inserted. A big copper pin holds the hammer in place. The flat butt of the Tosa-style is generally fully covered with a copper plate. Making it a bit more stable when it comes to loading.
One feature that makes this gun stand out compared to other Tosa-style matchlock (and also proofs that nothing is cut in stone when it comes to special features on japanese matchlocks) is the trigger. Normally the trigger is placed together with a so called metal "sea slug" positioned just behind the trigger and is a part of the firing mechanism. This one has only one trigger and the "sea slug" is cut from the stock itself.
The Tosa-style tends to be large caliber teppos with an average of 10 monme. This particular gun has a caliber of 2 cm which make it slightly bigger than a 10 momne but still falls under this classification. This gun is also fitted with a silver inlay on the frontsight for better aim during firing in the night
The average length for this modell is a round 110 cm with a barrel of about 75 cm. Depending on the amount of iron the total weight seems to be between 4-8 kg. This one weighs 7,8 kg.
The signature reads: "Tosa ju Kawasaki Genzo Sadayoshi Saku" and the gun was made 1840.
This Tosa-style matchlock has most of the "classic" features expected from a gun produced in Tosa. Really looking forward to some more examples and be able to compare the overall looks.