so that makes my black one wrong too .
No. That's M suffix and would make it a very early 90s. That might explain the odd rear hub too. /5 series bikes had that cover fitted but not the later /6 bikes. The bike will probably have the earlier/5 switch gear which early 90S bikes had too.
The registration date is a bit weird (as already stated) but sometimes things do hang around, but the rear light is a post-81 variety. The timing cover is post-81, and has been ground down. The clocks are the wrong colour (green numbers) and the rev counter is electronic. The front wheel axle is sticking out a bit more than it should on RHS. The oil cooler is a bit unusual (but not really unwelcome). There's a stripe on the rear mudguard (which will give the rivet-counters a big heart attack) which is a personal preference after a respray but not standard/original. There's no cross-pipe for the fuel supply. The exhaust nuts are not /6 (but who cares?). All in all a lot of irregularities which point toward it not being an R90S. IMHO.
M is 1974 when it is at the end, 1995 when at the front. This one is the former. The 'odd rear hub' is just a bit of trim and can be fitted across the /5 and /6 range (and later if wire spoked). The 'earlier /5 switch gear' looks the same but the /6 bikes (and this probably included) have different wiring in a minor but important way.
It should also have a smooth case gearbox ,and the handle bar clamps are not 90sThe registration date is a bit weird (as already stated) but sometimes things do hang around, but the rear light is a post-81 variety. The timing cover is post-81, and has been ground down. The clocks are the wrong colour (green numbers) and the rev counter is electronic. The front wheel axle is sticking out a bit more than it should on RHS. The oil cooler is a bit unusual (but not really unwelcome). There's a stripe on the rear mudguard (which will give the rivet-counters a big heart attack) which is a personal preference after a respray but not standard/original. There's no cross-pipe for the fuel supply. The exhaust nuts are not /6 (but who cares?). All in all a lot of irregularities which point toward it not being an R90S. IMHO.
The Silver Smoke one, on the other hand, looks quite nice, I agree, but not th subject of this thread and not my favourite colour!
I think the OP wrote an early 90S, as in the bike, not early 90s, the decade.Aka Suffix. Wot I said diddle I.
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I fully admit to not spotting that one - thanks for helping me out!
I can be such an idiot sometimes, when my head is buried! 
