Based on the dead-wax matrix information, US-pressing copies of the vinyl  DARKNESS album are roughly classified  into two groups, one with and another without a machine-stamped TML marking (either TML-M or TML-S), a proof for the early pressing issues that were mastered by Mike Reese at The Mastering Lab, Inc., Los Angeles, California. So, any vinyl copies lacking this stamp on both Sides 1 and 2 are instantly excluded from the list of my "variation" analysis on the U.S. version of this classic album (A series on this subject starts here). 
