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THE 1 2 P
Lot Number(on box next to upc code): Jaspers are 0844 or higher but there are some 0843 Jaspers too
Build Date(above the serial number on the console): Jaspers are from November 2008 and later. However, their test model had a build date of 10/14(October 2008). On the motherboard it's labeled "Jasper 1 weeks run" so it was most likely an early test batch.
Power Brick: Heres where we will have some discrepencies. Their initial indication was: 203W=Xenon, 175W=Falcon, 150W=Jasper. While having 150W is a pretty safe bet that you have a Jasper, you could also have one at 175W(like I do). Their guess was that Microsoft had left over power bricks from the Falcon chip models and decided to incorporate them into the earliest batches of Jasper models.
Number Designation: On the back of your console above the words "made in China" will be either 16,5A(Xenon), 14,2A(Falcon) or 12,1A(Jasper).