It would have been early '80s Stubbies; probably '81-'83.
The Open Class went off a few minutes earlier, which is why none can be seen. I think there may have been a mark off Reef Beach, to keep us away from the ferry lane.
It can't be a reverse pic, because the starboard numbers are higher as they should be.
I can recall the Stubbies had maybe 10-15 knots from NNE, but in one or two of them the wind direction shifted radically to the north or NNW at the start line because of the land influence. The seeded sailors from the previous year had been given a special area on the theoretical upwind side, near the ferry wharf, which put us in a serious wind shadow, so we all just moved down the beach, rather to the annoyance of those who had grabbed the front-line spots there earlier. I think it was similar most years, so the apparently strange wind angle is just a very local thing.
If that was the year that Lach won the Open class/Overall event, it would be the year that a multiple Div 2 world champ from France, Robert Nagy, was second. Jessica Crisp and Rob Howard were 3rd and 4th (or 4th and 3rd) having got past the guy who had been in third most of the race, when they came past the Bombora to the finish and had to run the gauntlet of what was (at a conservative estimate) 150,000 Hi Fly 555s and Stip Holidays, all still on the first leg and all continually either falling, veering to port, veering to starboard, sinking or doing all of them at once - and not one of them knew the rules, or how to judge the speed of a Div 2 board railing and planing upwind in 10 knots of wind. It was like a battle of Britain dogfight as we lapped them all.
Not that it's a bitter memory, or anything, to remember Jess and Rob railing past as we went through that massed windshadow

And of course, the fact that they were much better sailors had nothing to do with it!
Nagy was a nice guy, but incredibly hyped up and vocal on the water; I still remember hearing him screaming from a couple of hundred metres behind up that last leg.
PS - I can recall LOTS of hot westerlies in those days, and earlier.
PS - Hey, KA 360, are your initials AH?