Nice bike sir!

I doubt you registered it in suzhou (苏E) as registration of bikes is banned there since 2008. Most the 'dodgy' plates these days come from Huai'an in northern jiangsu (苏H).

But anyway there are many different levels of dodgy registrations. Some are outright fake while some are real registered plates acquired through questionable channels. I have the latter on one of my bikes, have been stopped by police and my bike came up in their computer and everything was fine. If you don't know what kind of reg you have, best not stop for the police anyway...