A team has finished a game with 12-12-4 runs-hits-errors line 7 times since 1897, most recently Chicago Cubs on 3 July 1998. That is about one every 63,286 team-games.
Box score for the most recent one ↗
12-11-6 12-12-0 12-12-5 12-12-1 12-12-2 12-12-3 12-12-4 12-12-6 12-12-8 12-13-4 12-13-2 12-13-1 12-13-3
The whole distribution — Runs-Hits-Errors Lines · All 18 shapes