The very sad fact is that they'll be worth next to bugger all, unfortunately, such is the general public's lack of appreciation of this "old crap" and Centon was hardly a big name.
I've still got my whole Olympus OM system outfit (primes from 18 to 200mm, (some of them M system) plus a couple of bodies and even that lot's worth so little that I can't bear to part with it.
It's probably only the M-1 body and M system lenses that are worth much at all, to be honest the rest I might as well give away.
To give you an idea, I sold my Zeiss Ikon Contarex outfit a few years ago - two bodies, four Carl Zeiss lenses plus accessories- and only got less than £400 for the lot. A Contarex body plus F1.8 Planar cost that much in 1968 when I was earning less than £20 a week.......
That's why I won't sell the Olympus stuff, that and the fact that the M-1 was a 21st birthday present in 1973.
Keep it and get into some B&W work is my suggestion if you want to get something from it, because it certaiinly won't be any financial reward.