MEC XO specs (MEC AH1BV / AH1DV)

[0xdeadbeef]

I kinda fail to find a data sheet for 12MHz SMD crystal oscillators by MEC labeled AH1BV and AH1DV.
They look like the S series, except for the marking:
http://www.mecquartz.com/image/download/smd49s.pdf

The label on the first part is
"12.000 G
  MEC AH1BV"

And the 2nd one is the same but with "MEC AH1DV" in the 2nd line.

Any hint where I can find a datasheet for this or if the specs are somehow coded into the characters?
I'd be especially interested in frequency stability (PPM).