Not sure if it's 4. You lose count of these things. Two coups in the early 80's I think. 1980 (?) I was in Don Meung Airport when Gen Prem was driving in a tank convey from the airport to Dusit to oust some coup plotters (long time ago and perhaps I'm mixing my memories). Then there was the April fools coup, was that 1985 ?. Then Gen Kraponyu's self seeking coup in 1991.