The "Windsurfer" brand did a few different models in the mid to late 80s. There was the Transformer wave board, and an epoxy slalom board too.
My guess is there was an arrangement with Bombora. Bombora made a board that was almost identical to the Windsurfer One Design (with a fully retracting alagier daggerboard, US fin box and sliding mast track). The Windsurfer Transformer was an awful lot like a Bombora Antartica.
The board in the photo looks identical to the Bombora Capricorn. I reckon what Anise says sounds right.
I've got mags with ads for an Express, and in fact I've seen a couple for sale in Oz and wanted one for the grandkids! Windsurfer (USA) had a few such boards and I think the Express in the ads looks like a baby One Design. I can't remember the designer although I think it's mentioned in the ads.
The Express in the ads had nothing to do with Bombora; they were very different designs.
yep, just like Chris said ; here is an ad from US Windsurf 1984. I reckon Anise is right and the Australian Express is a Bombora Capricorn and a bit later, at the time Windsurfer in Australia was Sailboards Australia as was Bombora.
I still have 2 of these boards lying around in South Africa. I had some of my best sailing days on these as a teenager. I learned to waterstart and gybe on these.
The're heavy, slam chop like you hit concrete (but with the weight you keep going), and for some reason the mast foot at some stage would slide forward in a gust - I could not tighten it enough when younger. I also got rid of the skeg early on - it interfered too much with waterstarting.
The bottom shape was different than the pictures though. The ones I have are completely flat area from the skeg to the bow, and have a single concave about 30cm wide from the skeg all the way to be tail. The board aft has a slight V shape (with the concave area cutting the point of the V).