Damn, thats beautifull !

Yup, it´s old because it is cast out of lead and not tin. You can see it on the white and very light brown oxyde. Also the grade of corrosion doesn´t happen to lead within a few decades!
If you know a restorer in your area, let it be cleaned with air abrasion and round glass beads on very low pressure ONLY!!
The white lead oxyde will disappear without damaging the nice Patina!
This is less than 5 Minutes work and will not coast very much.
Don´t try it yourself on lead! It is VERY harmfull to your body!!