Just to put some life into this old thread. Yes, that fork has had a good knock....
I have a similair Cove build RIH. Just not the blue on the standing tube.
Full 531 frame, Shimano 600 arabesque,SR, Tange, Weinmann brakes and rims and Normandy hubs.
No framenumber! No type indication.
Shimano parts have dates of 1978 and '79. Frame has brazed on cable support for front and rear derailleur. So 1980 RIH Luxe, made in Venlo is a good guess imo.
Although the paint is badly damaged, I still like the looks of the bike!