If you get the stepping codes off the chip, it will have that data (date) as well as indicate which fab plant it came from, or maybe its the just "batch". As you may know, most think these codes (stepping code) provide some indication of how well an OC you may get.
Also this
SITE has a database of OCing. So you can look how Bartons, with the same or other stepping codes, are reported to OC (along with vcore and cooling methods).
To see the stepping codes printed on the chip, you'll have to at least remove the HS+F. Although with my poor eyes I generally need to remove it from the mobo and use a magnifying glass

(When I buy a chip these, I just write this stuff b4 I install it)