#2896 - bought from HeadRoom in April 2006. This one is making the Loaner #3 circuit (see link in sig).
#10073 - bought from BlueCraze in December 2006. Sold March 2007.
#10310 - bought used on the FS forums here. Seller said it was bought new in March 2007.
The great thing is that I'll get to compare #2896 with #10310 in a few weeks and find out if AKG made any production differences between batches.