This kind of mussel is a river mussel, which is very tenacious, there is a river to the east of our village, and the photo is from last year when they went down to the river and touched it up.
The mussels are usually found inside the silt in the river and are most abundant in the summer months of June, July and August.
Wish the owner a successful life and happy family, don't forget to reward me with an adoption.