First Class Tickets to the US from 100K miles return and Concorde return for 125K miles + there were loads of promotions.
When Oneworld first came out they offered 100K miles for visiting the major continents. I duly booked a F RTW ex BCN which was only abut 2.5K in those days and went LHR-JNB-PER-SYD-AKL-EZE-LGW. The flying earned loads of miles so was a great way to bum around the world in F and end up with a free Concorde ticket at the end of it!