Russian Saw Back Side Arm Tula 1842

Russian Saw back Side Arm Marked Tula 1842 Large brass hilt with cross guard and langets, the large blade with sawbuck edge and blunt end showing what looks to be a makers stamp but too worn to identify. Overall length 84.5 cm the blade 69 cm and 5.5 cm in width, note slight movement between hilt and blade