Has an Olympic Baseball game ever ended 12-7?
Exactly once. On August 21, 2004, Greece beat Italy 12-7, and no Olympic Baseball game before or since has ended that way. When it happened it was a scorigami, the first 12-7 in league history.
That makes 12-7 the 48th most common final score out of 87 that have ever occurred in Olympic Baseball. One point away, 13-7 has happened never and 12-8 has happened 1 times.