Very intriguing "match" rifle.
I would guess 1875 to 1885. The hammer is likely superfluous to the actual firing of the rifle & might be only to keep or help keep
the bolt closed and act as a stylish 'locking' mechanism or part thereof.
On the other hand, it might indeed hit an internal striker (firing pin) inside the bolt, as in Martini and Springfield military rifles.
I see the rounded nose of the hammer fits into a hollowed slot of cut in the back of the bolt.(rounded nose goes below the outside edge of the bolt rear. Obvious in the side picture.