as far as I could see there are no markings on the front of the compressor housing, to tell the truth there was a small marking but I couldn't really make it out and it didn't look like it was an ar number.
Something else I noticed when I had the turbo off is that there was quite a lot of sideways movement on the turbine. If what I've read is correct then this isn't a problem as the slack is taken up when the oil gets round the bearing.
No smoke though so must be okay.