Hehehe, well, it was more a country code than company code. The Ebay link I sent actually lists all the country codes they use :D It's pretty interesting :D
Found this on a website.
1) All rackets provided by Sunrise must be marked SP on shaft and it is it's own marking to distinguish Sunrise distributed products for after sales services.
2) Sunrise's agentship covers Hong Kong, Indonesia, so you can find HK and IP code in SP rackets.
3) Sunrise's agentship does not cover Thailand, so you can find TH on the cone, but no SP on shaft for TH rackets. For TH rackets, there will be no warranty for Sunrise's agentship covered countries.
Hey Angela, I had a look online cause I wanted to know for sure... and it looks like there could be a SP version. A lot of people are trying to sell it, but I'm not 100% certain. Might email yonex to be sure.