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I don't think it matters about board number. I think it matters if it is a 148GTL or 2000GTL. I compared front mic 148's and side mic 148's and it seems the silk screening (L47 and L48) is the same for those 148's...even though they have different board numbers.

All the 2000's I have..Malaysia, Taiwan, Philippines all have the same silk screening for L47 and L48.

So the difference seems to be if it is a 148GTL or Cobra 2000GTL board.