Mysterious US reissue of Gerry Mulligan Night Lights

I sometimes get this US reissue of a great jazz title,
Gerry Mulligan Night Lights
The sleeve looks like original, label design almost identical to the original, surely it is a Mercury US pressing but what year they reissued? What kind of master they used?
There is no concrete info...
Looking at the deadwax, 
PHS 600108A-PR3, PHS 600108B-PR3
Stamped. And...
There is another STAMP,
MASTERDISK
and next to the stamp, GK is hand etched.
Do you have any clue?
If you do, please let me know!
  • Hello,
    I look at the beginning for the 1st dry cleaning but unfortunately I made a mistake because it is a USA reissue on masterdisc and it must date from the end of 70 – beginning of 80. The mastering done by their 1st sound engineer Mr Kong, normally that must make beautiful music. Only downside that I paid a little too much for it, but that’s my fault because I didn’t watch the matrix well. Again the problem with the USA editions – it’s the same (absolutely! same!) catalog number…

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