No, I don't think that this mic is a fake, or that its guts are not genuine M49. The components certainly are period-correct for a first-generation M49.
That fact was established when the owner lifted the hood and shared its innards on GS. But that information was not available at the time "halsalarm" posted here, last fall.
But the authenticity of its finish and its serial number plate remains an opinion that no one has authoritatively confirmed as fact at this point.
What raises my suspicion: finish looks unblemished, and serial number plate looks new, while the mic's bottom bell is well worn. These things usually don't go together.