In 1991 the RAF CAM World Cup Wave Bjorn Dunkerbeck edition sail joined the line-up and just like the original 1990 RAF CAMs featured the removable CAM above the boom batten.

The RAF CAM World Cup Wave (Bjorn Dunkerbeck) sail is notable in that it doesnt have the double front window (introduced in 1988) (potentially because large parts of the sail are clear anyway (as a result of monofilm construction). Additionally, the Neil Pryde name continues to appear on the back leech of the sail at the top (introduced in 1989) and there is no zipper on the bottom batten pocket. 

Performance-wise one notable thing about this sail is that the COE (Centre Of Effort) remains further forward (almost like the 2015 NP models) Where this sail differs from more recent versions is that it does NOT have a loose leech, thus it holds the power and gusts.