It’s probably an 2006 on an 07 plate. I have two 2007 reg xt660 but one is an 2006 bike as it has no 02 sensor on the left pipe. So if yours has no sensor it’s a 2006 bike on a 2007 plate very common it’s just a late reg. I have a 2015 fz1 but the paint code is a 2010 code so that bike is a 2010 model first registered in 2015 would never have known apart from I needed a belly pan painting that’s how I found out very very common. Yours would ride well if it has a power commander on that fixes all the problems with the bike better than the other mods.