I'm pretty sure you have a Stronglight 49D on that bike

Just remember you need a stronglight crank puller to take it off. Kind of wondering how the Suntour rear mech works on the huret dropout (for future reference) Sweet bike BTW!
Edit: just re-read the post (dang merlot) Why would you want to swap the 48D for a Nervar Star?
Cheers,
Chris