Thanks T-Mar.
I've double checked on the paint. While at first I thought it was not the original color (also, no decals/stickers at all) by now I'm not so sure anymore. At least there is nothing but black where ever you look (BB shell, steerer tube).
As a summary, this is most likely a 85 model but a combinmation of the concave seat stay caps and no fender eyelets did not exist either in 84 or 85.
So it may not be a Centurion after all, or a variation for the Australian market.
Are you or is anyone aware of this serial number formant N4S5293 distributed by some other brand? Something to send me off to have a look?
Lastly, has anyone ever put a bare #1 or #2 frame onto scales? Just curious.