Was that the one where they sent you stickers and promotional literature and newsletters etc? It's a very long time ago (late 70's / early 80's) but I recall belonging to something like that. If my memory serves, it was promoted via the camera shop from where I bought most of my kit.
I doubt if I have anything at all left of the stuff they sent me, though I do remember getting very cross with a sticker that refused point-blank to adhere to the outside of the 'Hakuba' alumnium flight case in which I stored my OM1, OM2 and lenses....!! Funny what sticks in one's memory over the years, eh?