Just for the record, The AB matrix is:
R1-631404-C
081227906818 CB
I didn't look through every pressing but it didn't match the 2011 or the 50th Anniversary pressing.
All of the matrix on each record I looked at follow this pattern. The only difference I noticed was the letter after R1-631404 changes depending on the disc. So WMD is A and B, AB is C and D and so on. It appears the matrix is basically done as the complete package, rather than disc to disc. Which is cool.
R1-631404-C
081227906818 CB
I didn't look through every pressing but it didn't match the 2011 or the 50th Anniversary pressing.
All of the matrix on each record I looked at follow this pattern. The only difference I noticed was the letter after R1-631404 changes depending on the disc. So WMD is A and B, AB is C and D and so on. It appears the matrix is basically done as the complete package, rather than disc to disc. Which is cool.
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