Usually for JP code bag, the tag on the bag will be written with Japanese characters. JP coded and SP coded bag have different Item Code. For example : Bag 9231 WEX has the code of 1201W in JP. In the market, beside SP & JP bag. There are TW bag as well. To my knowledge, TW version slightly better than SP version, but it still could not match JP bag quality. My advice : if you really care about quality and have the budget to buy JP bag, please buy JP bag then, otherwise, buy different brand.
BAG 9231WEX = "TW" but is really EX (these are made in Taiwan) and according to most are more than slightly better than SP like http://www.badmintoncentral.com/for...n-Sports-Life-Singapore?p=1889755#post1889755. SP bags have "SUNR-" in the name like http://www.badmintoncentral.com/for...n-Sports-Life-Singapore?p=1883048#post1883048
Nice bag! From the photos, it looks bigger than i thought! Im looking for a mizuno bag as well, but stuck between 6DT-228 and 6DT-215, havent make up my mind which to buy