Quoted from phyreteam:16 Games/66 balls on a Premium, playfield date stamped Dec-07/2016.
My premium has the same playfield date but I haven't played it yet. I just took off the glass to check the playfield and plugged it in for the first time. No ghosting yet that I can see. I was inclined to let the playfield cure for another month, doubt if it makes any difference for ghosting but maybe would reduce dimpling?