The Buenos Aires Timezone is a LE of 100 watches.
The usual city which replaces Caracas is Santiago.
Buenos Aires is only used for this LE and replaces Rio de Janeiro used for the "normal" Lange 1 Timezone .
Santiago is still used on the cities ring for the Buenos Aires Timezone. The sequence is: St Georgia - Buenos Aires - Santiago - New York and so on...
Things are a bit complicated !

Fr.Xavier