1984 - The only fully battened Neil Pryde Sail was the Ultra Nova. For the record this was an amazing sail

1985 - Introduced the first generation RAF Wave sails. Often in pink these high aspect incredibly short boom sails have a distinctive look and dual windows on top of each other, 1985 also the introduction of the Garda series. These sails were a more traditional, modern wave sail - distinguishable because the are all dacron contruction. (Note the Garda series rand from 1985-1987)

1986 - this is where it gets tough as the 1986,1987,1988 sails look similar. Neil Pryde introduced the RAF Wave, Wavelite, Slalom lite, RAF Slalom and Warp Speed  sail lines. To date your sail 1986/1987 you need to look at the name of the sail, the cut of the sail and also the size, as not all sizes were available in all years.

1987 -The sails from this year are easily confused with the 1986 sails, but there was even greater variety and different sizes. For example the sail above is a 4.9 RAF Speed. In 1986 the RAF Speed was not available in 4.9.... In 1987 there was: RAF Speed, WARP Speed, RAF Wave, World Cup Wave, RAF Slalom, RAF Slalom lite, RAF Garda

1988 -Im yet to track down a 1988 catalog but I believe the NP RAF Wave was modified to include an additional front window (as per the NP RAF Wave Mark Angulo signature model above), not previously shown in any prior catalog 

1989- One of the ways you can identify NP sails from this year (apart from name and size) is they started writing Neil Pryde on the back top of the sail. The range and names of the sails also increased : COMBAT WAVE, WORLD CUP WAVE, RAF WAVE, RAF DYNAMIC, RAF SLALOM, RAF SLALOM-LITE, WORLD CUP RACING, RAF SPRINT, RAF SPEED.  Monofilm is introduced on some sails.

1990 - This year was the year that the versatile RAF CAM was introduced. Sails in this year had names like RAF CAM Wave, RAF CAM SLALOM, RAF CAM DYNAMIC. We also start to see the introduction of more clear / monofilm sails and the end of dacron / mylar composites