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A datum is a perfect plane, axis, or point. So on that count, yes a centerline can be a datum. However, on a drawing that centerline should never be identified with the datum feature symbol (the triangle with the letter) because a centerline is imaginary, and we can't touch it.
Presuming that is a bore, -A- is the bore.
I would presume that wherever they dimensioned the bore itself, they also put the -A- tag, and this is just to help keep track through various views.
While I wouldn't put anything past some of today's engineers, you can't say a single line up the wall of a bore is a datum, not and expect any two people to get the same results inspecting, anyway.
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