Good find, Bacillus. I've always wanted to know when my "non-overclock friendly" TBird was made as well! I have a pic of the core at home...check later.
Does the site you got this pic from also have a listing of known "good" or "bad" overclocking chips? I'm curious to see where mine sits. I get between a 10-11% overclock, even with full voltage and that it. Forget about stable...it won't make it past the desktop without locking. At a 10% OC, which is what I'm running now (1GHz TBird @ 1103 10.5 x 105) it's rock stable though. Thanks.