Hello. Very nice Turkish Rifle. Wish I had found it.
My guess would be early 19th Century. The lock on this one is interesting. Overall looks Turkish made, the hammer design looks somewhat Spanish/Portugese influenced.
The mainspring is mounted very low on the plate. Also, the hammer screw appears to have fine vs coarse threads? Never seen that hammer style on a Turkish rifle. But, the lock looks complete and original. Is the lock in working condition? Again, nice piece. Congratulations. Rick.