How to determine week #?

[Crush]

I'd like to input my info in the cpu database, but I can't find any information on this site on how to determine things like batch # and week #. I was able to figure out the batch # and S Code by looking through the figures already in the database, but how is week # determined? I can't find any correlation between what's in the database and what's printed on the end of my slot 1 cpu. FYI, it's a retail Cu650 with an Alpha heatsink. Where do I look to fine week #?

Thanks.

[Tim-]

Here's an example:

98140233-0011 MALAY - FPO# and country of assembly
9 - Plant code
0 - San Jose, Costa Rica (A6/T6)
1 - Cavite, Philippines
6 - Chandler, Arizona (A4)
8 - Leixlip, Ireland
9 - Penang, Malaysia (A1)
A - ???
Q - Malaysia
R - Manila, Philippines
Y - Leixlip, Ireland
8 - Year of manufacture (1998)
14 - Week of manufacture (14th week)
0233 - remainder of FPO# (test lot traceability number)
0011 - Serialization code
MALAY - Country of Assembly