Rosary, please help!

Good evening,
This rosary has been in my jewellery box for some time, can’t remember where from. It might have been my grandmother’s.
I know nothing about it, it looks brown beads, could be wood, could be anything else.
There is a chain that keeps the beads together, looks like metal.
I would like to know what is it made of and how old is it?
I am thinking to give it to my local charity, please stop me if this is something I should keep.
Thank you.
Kind regards,
Simona

 

seems quite a nice one, nicer than most i come across anyway, i would keep it

lightened the pics, as its quite hard to see

what does the back of the cross look like ?

 

I bet that’s bog oak.