Join Date:Joined: Apr 2010
It's the Japanese version, not the Chinese version.
In Japan, there are a few extra things included with the Xperia X10 that aren't on the standard phones, like the Japanese keyboard, an extra social network in Timescape, and a carrier marketplace.
I have a newer build number than the one listed above, however. I used to have a older version, but the phone seems to have installed a newer version OTA.... it fixed the crappy battery life I've been having.