Bill:

I've run into boards with this appearance before.  You should see it on the
'as received' boards.  What you're seeing is dewetting at the knee of the
hole.  If my memory is correct, you will not get good hole fill after
soldering and the top side filets on holes with leaded components will not
wet out onto the pads completely.  It's been several years but the cause may
arise from copper contamination prior to HASL.  Possibly from a poorly
vented or contaminated curing oven for LPI final cure.

My memory is fuzy about the root cause, so don't take it as a certaintity.
Hope this helps.

Don Vischulis

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