Help is required,,

I am posting some pictures of an old under lever air rifle .It is not in working condition and I really dont know if I could arrange for spares
The butt was broken ,,,,I got it fixed,with a different butt of another gun
At some places ,on the rifle, 13 is written,and on the trigger ,79 is written
The name of the Manufacturer is not clear,although I tried to scrub it and make it visible,,,but my efforts went in vain
I wish if some inputs could be provided regarding this Air rifle
Regards