Rich is right on this, one base, no two'fers here. There is nothing in the rules that explicitly covers this wild pitch/bb sitch but it can be figured out.
Let's say there was an R1 and R2 at the time of the pitch. If you gave the batter one base for the BB and one base for the overthrow you would also have to give R1 and R2 an undeserved two bases each. Can't happen. G
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