
Try this site (
hitthewave.wordpress.com/2011/05/02/windsurfing-brochures-ads-80s-90s/) for old windsurf gear reference. If you look closely you'll see some pretty cool gear.
I agree it is a windspeed. It was one of the less common brands available in the 1980s in Australia.
Given the molded-in logo on the top deck it looks like it was a genuine windspeed (not another brand which just borrowed thier deck fittings). I would suggest it was a very early 1980s model. There were a few brands which had a semi-displacement bow like this one (like the Dufour Wing and Bic 250, albiet in a more rounded version). If you look on the site above you will see a few with pretty similar shapes from 1980-84.
It appears the centreboard is fully retractable and has several positions fore and aft. That was pretty radical in the day. It wasn't until the about 1987 that the Windsurfer One design moved on from the fixed centreboard system. I'd think the large centreboard, hard rails and displacement bow would allow it to go upwind very nicely. I agree with Chris 249 that it would be pretty snappy in light winds.
Are there any full shots of the underside?
I'd keep the old girl for light wind days, it would cut through the water like a Division 2 board while everyone was whinging about there being no wind. Don't throw it out.
Clarence