http://cgi.ebay.com.au/Sailworks-Sails-5-1m-5-6m-6-1m-Windsurfing-Sailboard_W0QQitemZ280458490393QQcmdZViewItemQQptZAU_Sport_Surfing?hash=item414ca0f219
What year are these?
I would guess early 90's. The Sailworks website has details on sails back to '94 and none look like this.
Yeah early 90s. I had a 5.9m 94 Sailworks Quadro and it looks very similar to these sails but a little bit more modern.
I had these in a 5.1m and 5.6m when they first come out, i think it was in 90 or 91, they where excellent sails for there time..
fully delaminated greasy chip bags will explode in the first couple of gybes or jumps.
go on, treat yourself! 
