Actually, on closer inspection, that S1 is NOT a Sport 135. It may have a 135 head etc - so be it, although how will you tell - but it has the wrong seats, no decals, and a black roof.
S1 Sport 135s had Corbeau trimmed red and black cloth seats, blue hoods, S135 decals behind the doors, amongst a few other significant details not least the exclusivity of a very short production run of about 100.
Be careful if you go to see this. Not saying it's a bad car (it doesn't need much to make a standard S1 a fully fledged S135-equivalent) but you CAN'T make it the real thing, with the additional value that would bring! If it's being advertised as a Sport 135, what else are they trying to say about it that isn't strictly true...
Also, watch out for the fancy extra diffusers front and rear. In a nutshell...it's been pimped

Campbell
(trainspotter faction)