My old one has beading around the edge of it and a strap across the middle. Yours looks like it's had an aftermarket cover plonked on it.
Like @fastbob said, if it's got "made in Japan" on most of the bits then it's almost definitely a nostalgia model.
Someone, somewhere posted a list of the frame numbers for the nostalgia model - there were only a few hundred imported so there's not a huge amount of UK specific information.
Compare yours to mine. Look at stuff like the engine casing - it's got "CDI Honda" on it, the bodywork is right, the gear sequence is right, it's got the correct stickers on the chain guard, the list goes on. That's an awful lot of trouble for someone to undertake just to mug you off!
Just be happy that you've scored a desirable bike and ride the bloody thing!