There was only one "Mexican Sundial". Somewhere around May 1977 the suit was used so intensly all kinds of damages started to occure. One of those damages was the loss of cuff buttons. Finally they decided to re-arrange the cuff buttons in a way that on every sleeve a total of eight buttons wre left instead of the usual twelve.
By the way, the same thing happened with the "Ace of Spades" during 1977.