This catalgoue is extremely careful to not show any dates at all, but I think that it dates from 1980. It features the original MAVIC 800 derailleur - but is notable for not claiming that it is 'new' - as you might have expected in 1979. It also does not include the MAVIC G40 rim - introduced in the 1982 model year.
The image of MAVIC rims on page 2 would deserve a place in any art gallery.
Browse associated derailleurs.