you are a star thanks,
According to those details the original chinese manufacturer of nellya's ycf stunt was a company called "Jiangsu DHCLBC Vehicle Manufacture Co Lt" selling bikes under the brand name "sanje, lbc".
The model number is not what i thought it would be for a ycf unless ycf used multiple suppliers?
lbc125gy seems to be the bike shown in the original topic and i have found far more pictures with this model designation and ycf decals
The rxs125gy-9a said to have been supplied to ycf.fr by the supplier in the advert has the exact picture as some lbc125gy adverts i have found both bikes list the same type approval numbers.
Good news though, the frame number on the bike I have been looking at seem to follow the same format as those on nellya's bike.
So it must be from the same batch of type approved bikes, meaning registration should be less stressful as I can now use the type approval number legitimately along with the info supplied by nellya.
thanks again and all the best
sean