my RC200 F2 came (second hand in 1995) with what I thought was a Mavic front mech and M900 every where else.
Then I came across this ....
http://www.ebay.co.uk/itm/Suntour-Derai ... SwF1dUSCke and ordered one
Turned out to be identical, I can only think someone back in the early 90's polished off the Suntour logo, happy runs with a 48t chainring but sadly 50t is just a tad too big
I'm sure I saved the old one (I'll have to check) but if you want to try my old one for fit you can have it for the cost of a stamp, it works just fine but after 23yrs its a bit tarnished and I don't like/do "Patina"