BEWARE I believe this hasn't got an origional Sisley Mileometer in so mileage could be questionable even though mile is said to be correct with service history.
It is indeed one of the origional 500. Cream interior is the key give away, as well as lack of Sisley seatbelts as mentioned and they don't have instruction plates.
Another way to tell is age as there was a 18 month gap between the last of the limited 500 being sold, and them going into 'unlimited' production.
There is a discrepancy in the origional sales brochure for the 'limited' Sisley. It shows a Sisley with Sisley clocks and then another without But I'm lead to believe that this was an error in the brochure and that they we're all sold with Sisley clocks.
Will be interesting to see what this one goes for assuming the mileage is genuine!