Image of Copt Howe (Cup and Ring Marks / Rock Art) by Jeff

Interesting stone on private land within 1km of Copt Howe.
Looks like it had apractical use? Ideas welcome!
Narrow chipped groove runs down to the bowl, which appears to have a chipped overflow.
More recent marks across the stone should be ignored.
Has anyone seen anything similar?

Image credit: James Archer