OMAC #1 is cover-dated October but appeared on the stands in June of 1974. An awesome site where you can look up this sort of info for any and every DC comic is here:
http://www.dcindexes.com/database/index.php
One thing I particularly love on this site is seeing at a glance what DC titles would have been on the stands at the same time, for instance this page showing other titles you'd have seen next to the first issue of OMAC:
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Date: 2009-05-02 04:16 pm (UTC)http://www.dcindexes.com/database/index.php
One thing I particularly love on this site is seeing at a glance what DC titles would have been on the stands at the same time, for instance this page showing other titles you'd have seen next to the first issue of OMAC:
http://www.dcindexes.com/timemachine/coverdate.php?year=1974&month=9