Thanks George, I was definitely leaning towards natural / weathered.
Running my finger around inside they didn't feel like manmade cupmarks.
I'm not sure what the cupmarks on the lost stone looked like, I haven't found a picture so far.
Yep , they look like typical weathering of concretions .
I have seen a drawing of the linear markings and "petal " like motifs but not a pic of the lost cup marks .
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